ORCID Profile
0000-0002-5404-3909
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Materials Engineering | Functional Materials | Solid State Chemistry | Ceramics | Nanoscale Characterisation | Materials Engineering Not Elsewhere Classified | Condensed Matter Physics | Synthesis of Materials | Nanotechnology | Catalysis and Mechanisms of Reactions | Solid State Chemistry | Biomaterials | Nanomaterials | Condensed Matter Characterisation Technique Development | Electronic and magnetic properties of condensed matter; superconductivity | Materials engineering | Catalytic Process Engineering | Nanotechnology | Optical Properties of Materials | Nanomaterials | Nanotechnology | Functional materials | Condensed matter characterisation technique development | Biosensor Technologies | Mechanical Engineering | Food Processing | Communications Technologies Not Elsewhere Classified | Ceramics | Photonics, Optoelectronics and Optical Communications | Electrochemical energy storage and conversion | Environmental and Natural Resources Law | Macromolecular and Materials Chemistry | Inorganic Chemistry | Physical Chemistry (Incl. Structural) | Climatology (Incl. Palaeoclimatology) | Optical Physics not elsewhere classified | Enzymes | Energy Generation, Conversion and Storage Engineering | Interdisciplinary Engineering Not Elsewhere Classified | Carbon sequestration science | Surfaces and Structural Properties of Condensed Matter | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Condensed Matter Imaging
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Other | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Energy Transformation not elsewhere classified | Telecommunications | Solar-thermal electric | Chemical sciences | Physical sciences | Solar-Photovoltaic Energy | Education and Training Systems not elsewhere classified | Aluminium | Solar-photoelectric | Emerging Defence Technologies | Earth sciences | Ceramics, glass and industrial mineral products not elsewhere classified | Information and Communication Services not elsewhere classified | Renewable energy not elsewhere classified (e.g. geothermal) | Ceramics | Energy Storage, Distribution and Supply not elsewhere classified | Ceramics | Energy storage | Nuclear | Health and Support Services not elsewhere classified | Manufacturing not elsewhere classified | Hydrogen Storage | Hydrogen Production from Renewable Energy | Ceramics, glass and industrial mineral products | Expanding Knowledge in Engineering | Public health not elsewhere classified |
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Publications
Flexible phases, modulated structures and the transmission electron microscope
Publisher: Walter de Gruyter GmbH
Date: 11-2004
DOI: 10.1524/ZKRI.219.11.701.52428
Abstract: A review of the application of transmission electron microscopy to the study of interface, composite and displacively modulated structures is given. The distinctly different mechanisms underlying structural modulation in each case are emphasized as is the practical application of transmission electron microscopy to problems such as pseudo-symmetry and twinning, to indexation in (3 + d )-dimensional superspace and to overall superspace symmetry and structural characterization.
Microstructure development in electrospun carbon nanotube reinforced polyvinylidene fluoride fibers and its influence on tensile strength and dielectric permittivity
Publisher: Elsevier BV
Date: 11-2013
Boron nitride nanosheets as improved and reusable substrates for gold nanoparticles enabled surface enhanced Raman spectroscopy
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP00532A
Abstract: Boron nitride nanosheets covered by gold nanoparticles are controllably fabricated for highly-sensitive and reusable substrates for surface enhanced Raman spectroscopy.
A coupled electron diffraction and rigid unit mode (RUM) study of the crystal chemistry of some zeotypic AlPO4 compounds
Publisher: Elsevier BV
Date: 09-2005
High Efficiency Perovskite‐Silicon Tandem Solar Cells: Effect of Surface Coating versus Bulk Incorporation of 2D Perovskite
Publisher: Wiley
Date: 31-01-2020
Large electric-field-induced strain in centrosymmetric crystals of a dipolar ruthenium alkynyl complex
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP00528K
Abstract: Strong electromechanical coupling in centrosymmetric organoruthenium complex due to disorder in molecular packing.
A combined diffraction (XRD, electron and neutron) and electrical study of Na3MoO3F3
Publisher: Elsevier BV
Date: 09-2003
Giant magnetodielectric effect in 0-3 Ni0.5 Zn 0.5 Fe2 O4 -Poly(vinylidene-fluoride) nanocomposite films
Publisher: American Chemical Society (ACS)
Date: 26-07-2010
DOI: 10.1021/JP103777R
In Situ Formation of Mixed-Dimensional Surface Passivation Layers in Perovskite Solar Cells with Dual-Isomer Alkylammonium Cations
Publisher: Wiley
Date: 17-11-2020
Abstract: Dimensional engineering of perovskite solar cells has attracted significant research attention recently because of the potential to improve both device performance and stability. Here, a novel 2D passivation scheme for 3D perovskite solar cells is demonstrated using a mixed cation composition of 2D perovskite based on two different isomers of butylammonium iodide. The dual‐cation 2D perovskite outperforms its single cation 2D counterparts in surface passivation quality, resulting in devices with an impressive open‐circuit voltage of 1.21 V for a perovskite composition with an optical bandgap of ≈1.6 eV, and a ch ion efficiency of 23.27%. Using a combination of surface elemental analysis and valence electron spectra decomposition, it is shown that an in situ interaction between the 2D perovskite precursor and the 3D active layer results in surface intermixing of 3D and 2D perovskite phases, providing an effective combination of defect passivation and enhanced charge transfer, despite the semi‐insulating nature of the 2D perovskite phase. The demonstration of the synergistic interaction of multiple organic spacer cations in a 2D passivation layer offers new opportunities for further enhancement of device performance with mixed dimensional perovskite solar cells.
Ferroelectric and octahedral tilt twin disorder and the lead-free piezoelectric, sodium potassium niobate system
Publisher: Elsevier BV
Date: 11-2012
Highly Efficient Visible Light Catalysts Driven by Ti 3+ -V O -2Ti 4+ -N 3− Defect Clusters
Publisher: Wiley
Date: 19-11-2019
Superhydrophobic and Superoleophilic Boron Nitride Nanotube-Coated Stainless Steel Meshes for Oil and Water Separation
Publisher: Wiley
Date: 08-11-2014
Time-Disordered Crystal Structure of AlPO4-5
Publisher: American Chemical Society (ACS)
Date: 21-08-2017
Interface-Charge Induced Giant Electrocaloric Effect in Lead Free Ferroelectric Thin-Film Bilayers
Publisher: American Chemical Society (ACS)
Date: 26-12-2020
DOI: 10.1021/ACS.NANOLETT.9B04727
Abstract: Conventional refrigeration methods based on compression-expansion cycles of greenhouse gases are environmentally threatening and cannot be miniaturized. Electrocaloric effects driven by electric fields are especially well suited for implementation of built-in cooling in portable electronic devices. However, most known electrocaloric materials present poor cooling performances near room temperature, contain toxic substances, and require high electric fields. Here, we show that lead-free ferroelectric thin-film bilayers composed of (Bi
Structural Disorder in the Key Lead-Free Piezoelectric Materials, and
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/296419
IrOx·nH2O with lattice water–assisted oxygen exchange for high-performance proton exchange membrane water electrolyzers
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-06-2023
Abstract: The trade-off between activity and stability of oxygen evolution reaction (OER) catalysts in proton exchange membrane water electrolyzer (PEMWE) is challenging. Crystalline IrO 2 displays good stability but exhibits poor activity amorphous IrO x exhibits outstanding activity while sacrificing stability. Here, we combine the advantages of these two materials via a lattice water–incorporated iridium oxide (IrO x · n H 2 O) that has short-range ordered structure of hollandite-like framework. We confirm that IrO x · n H 2 O exhibits boosted activity and ultrahigh stability of hours (~8 months) with a record-high stability number of 1.9 × 10 7 n oxygen n Ir −1 . We evidence that lattice water is active oxygen species in sustainable and rapid oxygen exchange. The lattice water–assisted modified OER mechanism contributes to improved activity and concurrent stability with no apparent structural degradation, which is different to the conventional adsorbate evolution mechanism and lattice oxygen mechanism. We demonstrate that a high-performance PEMWE with IrO x · n H 2 O as anode electrocatalyst delivers a cell voltage of 1.77 V at 1 A cm −2 for 600 hours (60°C).
One-dimensional multiferroic bismuth ferrite fibers obtained by electrospinning techniques
Publisher: IOP Publishing
Date: 11-04-2011
DOI: 10.1088/0957-4484/22/23/235702
Abstract: We report the fabrication of novel multiferroic nanostructured bismuth ferrite (BiFeO(3)) fibers using the sol-gel based electrospinning technique. Phase pure BiFeO(3) fibers were prepared by thermally annealing the electrospun BiFeO(3) olyvinylpyrrolidone composite fibers in air for 1 h at 600 °C. The x-ray diffraction pattern of the fibers (BiFeO(3)) obtained showed that their crystalline structures were rhombohedral perovskite structures. Both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed that the BiFeO(3) fibers were composed of fine grained microstructures. The grains were self-assembled and self-organized to yield dense and continuous fibrous structures. The magnetic hysteresis loops of these nanostructured fibers displayed the expected ferromagnetic behavior, whereby a coercivity of ∼ 250 Oe and a saturation magnetization of ∼ 1.34 emu g(-1) were obtained. The ferroelectricity and ferroelectric domain structures of the fibers were confirmed using piezoresponse force microscopy (PFM). The piezoelectric hysteresis loops and polar domain switching behavior of the fibers were examined. Such multiferroic fibers are significant for electroactive applications and nano-scale devices.
Cathodoluminescence of boron nitride nanotubes doped by ytterbium
Publisher: Elsevier BV
Date: 08-2010
Ferroelectric and non-linear dielectric characteristics of Bi0.5Na0.5TiO3 thin films deposited via a metallorganic decomposition process
Publisher: AIP Publishing
Date: 12-2008
DOI: 10.1063/1.3032893
Abstract: Polycrystalline Bi0.5Na0.5TiO3 (NBT) thin films have been successfully fabricated via a metal organic decomposition process on Pt/Ti/SiO2/Si substrates. The structural evolution of the as-prepared thin films annealed over the moderate temperature range 500–700 °C is studied. NBT thin films annealed at 700 °C are of single phase NBT perovskite type. They exhibit a well-defined P-E hysteresis loop at room temperature. The measured dielectric constant is 465–410 over the frequency range of 1 kHz to 1 MHz. The corresponding dielectric loss is ∼10−2. The measured capacitance-voltage curve shows strong non-linear dielectric behavior leading to a high tunability of the dielectric constant, up to 14% at 1 MHz.
Structural Disorder, Polarisation and the Normal to Relaxor Ferroelectric Transition in BaTiO3 Based Perovskites
Publisher: Informa UK Limited
Date: 29-10-2010
Collective nonlinear electric polarization via defect-driven local symmetry breaking
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9MH00516A
Abstract: The introduction of defect-pairs into centrosymmetric rutile TiO 2 produces a new form of collective nonlinear electrical polarization.
Piezoresponse force microscopy studies on the domain structures and local switching behavior of Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystals
Publisher: AIP Publishing
Date: 09-2012
DOI: 10.1063/1.4745979
Abstract: The static domain structures and local switching behavior of relaxor ferroelectric 0.29Pb(In1/2Nb1/2)O3-0.44Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 single crystals at three crystal orientations are studied using piezoresponse force microscopy (PFM). PFM domain imaging shows that both the [001] and [111] oriented crystals exhibit a labyrinth-like surface domain pattern while at the [110] crystal orientation the domains are preferentially aligned along 〈110〉 directions. Vertical and lateral PFM images are used in combination to discuss the polarization vector alignment underlying the observed domain behaviour. Piezoresponse hysteresis loops acquired from these crystals indicate that the [111] crystal orientation has distinct local switching characteristics from the other two orientations in terms of, e.g., coercive voltage. Moreover, we investigate the tip-induced domain growth kinetics on an externally poled [001] crystal, the results of which exemplify an important role of extrinsic factors, e.g., the charge injection effect, in the domain patterning process.
Superhydrophobic and Superoleophilic Porous Boron Nitride Nanosheet/Polyvinylidene Fluoride Composite Material for Oil-Polluted Water Cleanup
Publisher: Wiley
Date: 03-11-2014
A combined temperature-dependent electron and single-crystal X-ray diffraction study of the fresnoite compound Rb2V4+V25+O8
Publisher: Elsevier BV
Date: 10-2004
An electron diffraction and bond valence sum study of the space group symmetries and structures of the photocatalytic 1:2 B site ordered A3CoNb2O9 perovskites (A=Ca2+, Sr2+, Ba2+)
Publisher: Elsevier BV
Date: 07-2004
Approaching Piezoelectric Response of Pb-Piezoelectrics in Hydrothermally Synthesized Bi0.5(Na1–xKx)0.5TiO3 Nanotubes
Publisher: American Chemical Society (ACS)
Date: 29-05-2018
Abstract: A large piezoelectric coefficient of 76 pm/V along the diameter direction, approaching that of lead-based piezoelectrics, is observed in hydrothermally synthesized Pb-free Bi
Ca-Doping of BiFeO 3 : The Role of Strain in Determining Coupling between Ferroelectric Displacements, Magnetic Moments, Octahedral Tilting, and Oxygen-Vacancy Ordering
Publisher: American Chemical Society (ACS)
Date: 18-10-2013
DOI: 10.1021/CM402962Q
Synthesis and chemical modifications of in-situ grown anatase TiO2 microspheres with isotropically exposed {0 0 1} facets for superhydrophobic and self-cleaning properties
Publisher: Elsevier BV
Date: 12-2015
Relaxor dielectric properties of a (Ca1.5Ti0.5)(NbTi)O-7 misplaced-displacive' cubic pyrochlore synthesised via metallorganic decomposition
Publisher: Elsevier BV
Date: 2008
Antiferroelectrics for Energy Storage Applications: a Review
Publisher: Wiley
Date: 10-07-2018
Natural liquid organic hydrogen carrier with low dehydrogenation energy: A first principles study
Publisher: Elsevier BV
Date: 11-2020
Underlying physics and chemistry of ferroic-photocatalysis: a critical review
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA05294F
Abstract: The significance of ferroelectric and ferroelastic materials physico-chemistry is summarized and detailed for various photocatalytic reactions, followed by an outlook on future advancements.
Volume imaging by tracking sparse topological features in electron micrograph tilt series
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.ULTRAMIC.2022.113475
Abstract: The sensitive coherent interference of electron waves arising from a specimen is useful for revealing subtle structural information in electron micrographs, which can be important for minimising dose and for rapid imaging. In general, dynamical diffraction is expected due to the useful strong interactions of electrons with matter, which can create phase contrast that violates the requisite Radon projection assumption for tomography. It is for these reasons that incoherent imaging modalities such as high angle annular dark field have been favoured to date in electron tomography of crystalline specimens, to access a monotonic relationship between specimen thickness and micrograph intensity. Here we use a geometric approach to track topological features that are robust to perturbation of the imaging conditions, to enable 3D reconstructions from electron microscope tilt series under imaging conditions that violate the Radon projection assumption, with an emphasis on phase contrast. Invoking a sparsity assumption, we demonstrate that topological features can be reliably tracked in 3D using a differential geometric form of stereoscopy, to circumvent departures from the projection approximation and reduce noise by effecting segmentation of interest points from the outset. We demonstrate this approach on a variety of different specimen and data types, from polyhedral nanoparticles, to steel dislocation networks, cryo-EM cellular structures and 3D diffuse diffraction of a relaxor ferroelectric.
In-plane implanting carbon rings into carbon nitride to intrigue nonradical photodegradation
Publisher: Elsevier BV
Date: 03-2024
A TEM study of Ni ordering in the Ni6Se5-xTex, 0 < x < similar to 1.7, system
Publisher: Elsevier BV
Date: 03-2004
Fully-inverted piezoresponse hysteresis loops mediated by charge injection in 0.29Pb(In1/2Nb1/2)O-3-0.44Pb(Mg1/3Nb2/3)O-3-0.27PbTiO(3) single crystals
Publisher: AIP Publishing
Date: 28-02-2011
DOI: 10.1063/1.3562034
Abstract: The domain structure and local switching behavior of ternary relaxor (001) 0.29Pb(In1/2Nb1/2)O3–0.44Pb(Mg1/3Nb2/3)O3–0.27PbTiO3 single crystals are studied using piezoresponse force microscopy. The as-grown crystals exhibit a labyrinthine domain pattern similar to other relaxor-based ferroelectrics. Abnormally switched domains are observed for both positive and negative tip-voltages, with sign-dependent thresholds and growth rates on the poled crystals. Further piezoresponse hysteresis loop measurements show that fully inverted loops can be observed under high switching voltages, mediated by injected charge fields. The dynamic behavior of the observed abnormal switching is qualitatively analyzed and the underlying mechanisms discussed.
Symmetry-mode analysis for intuitive observation of structure–property relationships in the lead-free antiferroelectric (1−x)AgNbO3–xLiTaO3
Publisher: International Union of Crystallography (IUCr)
Date: 21-06-2019
DOI: 10.1107/S2052252519007711
Abstract: Functional materials are of critical importance to electronic and smart devices. A deep understanding of the structure–property relationship is essential for designing new materials. In this work, instead of utilizing conventional atomic coordinates, a symmetry-mode approach is successfully used to conduct structure refinement of the neutron powder diffraction data of (1− x )AgNbO 3 – x LiTaO 3 (0 ≤ x ≤ 0.09) ceramics. This provides rich structural information that not only clarifies the controversial symmetry assigned to pure AgNbO 3 but also explains well the detailed structural evolution of (1− x )AgNbO 3 – x LiTaO 3 (0 ≤ x ≤ 0.09) ceramics, and builds a comprehensive and straightforward relationship between structural distortion and electrical properties. It is concluded that there are four relatively large- litude major modes that dominate the distorted Pmc 2 1 structure of pure AgNbO 3 , namely a Λ3 antiferroelectric mode, a T4+ a − a − c 0 octahedral tilting mode, an H2 a 0 a 0 c + / a 0 a 0 c − octahedral tilting mode and a Γ4− ferroelectric mode. The H2 and Λ3 modes become progressively inactive with increasing x and their destabilization is the driving force behind the composition-driven phase transition between the Pmc 2 1 and R 3 c phases. This structural variation is consistent with the trend observed in the measured temperature-dependent dielectric properties and polarization–electric field ( P - E ) hysteresis loops. The mode crystallography applied in this study provides a strategy for optimizing related properties by tuning the litudes of the corresponding modes in these novel AgNbO 3 -based (anti)ferroelectric materials.
Local strain, structured diffuse scattering and oxygen/fluorine ordering in transition metal oxyfluorides
Publisher: Informa UK Limited
Date: 2004
Bulk Incorporation with 4‐Methylphenethylammonium Chloride for Efficient and Stable Methylammonium‐Free Perovskite and Perovskite‐Silicon Tandem Solar Cells
Publisher: Wiley
Date: 10-01-2023
Abstract: Methylammonium (MA)‐free perovskite solar cells have the potential for better thermal stability than their MA‐containing counterparts. However, the efficiency of MA‐free perovskite solar cells lags behind due to inferior bulk quality. In this work, 4‐methylphenethylammonium chloride (4M‐PEACl) is added into a MA‐free perovskite precursor, which results in greatly enhanced bulk quality. The perovskite crystal grains are significantly enlarged, and defects are suppressed by a factor of four upon the incorporation of an optimal concentration of 4M‐PEACl. Quasi‐2D perovskites are formed and passivate defects at the grain boundaries of the perovskite crystals. Furthermore, the perovskite surface chemistry is modified, resulting in surface energies more favorable for hole extraction. This facile approach leads to a steady state efficiency of 23.7% (24.2% in reverse scan, 23.0% in forward scan) for MA‐free perovskite solar cells. The devices also show excellent light stability, retaining more than 93% of the initial efficiency after 1000 h of constant illumination in a nitrogen environment. In addition, a four‐terminal mechanically stacked perovskite‐silicon tandem solar cell with ch ion efficiency of 30.3% is obtained using this MA‐free composition. The encapsulated tandem devices show excellent operational stability, retaining more than 98% of the initial performance after 42 day/night cycles in an ambient atmosphere.
Structurally frustrated polar nanoregions in BaTiO3-based relaxor ferroelectric systems
Publisher: AIP Publishing
Date: 08-10-2007
DOI: 10.1063/1.2790481
Abstract: This letter presents direct electron diffraction evidence that structurally frustrated one-dimensional polar nanoregions arising from anticorrelated displacements of Ti and nearest neighboring O ions are responsible for the relaxation behavior observed in doped BaTiO3 relaxor ferroelectrics, rather than chemical short range ordering. The role of the dopant ions is not to directly induce polar nanoregions but rather to set up random local strain fields preventing homogeneous strain distortion, thereby suppressing transverse correlation from one ⟨001⟩ chain dipole to the next and hence the development of long range ferroelectric order.
Response of intergrown microstructure to an electric field and its consequences in the lead-free piezoelectric bismuth sodium titanate
Publisher: Elsevier BV
Date: 03-2012
Spin-wave propagation in α-Fe2O3 nanorods: the effect of confinement and disorder
Publisher: IOP Publishing
Date: 07-03-2019
Simultaneously achieving large energy density and high efficiency in NaNbO3–(Sr,Bi)TiO3–Bi(Mg,Zr)O3 relaxor ferroelectric ceramics for dielectric capacitor application
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA01808J
Abstract: A large recoverable energy storage density of 7.59 J cm −3 and high energy storage efficiency of 81.3% are simultaneously achieved in NaNbO 3 –(Sr,Bi)TiO 3 –Bi(Mg,Zr)O 3 relaxor ferroelectric ceramics.
Preparation and potential application of boron nitride nanocups
Publisher: Elsevier BV
Date: 08-2012
Earth-abundant transition metal oxides with extraordinary reversible oxygen exchange capacity for efficient thermochemical synthesis of solar fuels
Publisher: Elsevier BV
Date: 08-2018
Tunable Optoelectronic Properties of WS 2 by Local Strain Engineering and Folding
Publisher: Wiley
Date: 28-02-2020
Newspapers as tools to promote national agenda: How Chinese Communist Party newspapers frame images of the South China Sea disputes for national and international audiences
Publisher: SAGE Publications
Date: 27-03-2022
DOI: 10.1177/17427665221081945
Abstract: Using both quantitative and qualitative content analysis, this study investigates how two Chinese Communist Party newspapers frame the same story to international and national audiences. The empirical findings illustrate how propaganda techniques originally developed and applied in Western and democratic countries have been adopted and refined by newspapers in a state-run Communist press environment to create frames that best align with the cultural and political predispositions of domestic and international readers. The findings suggest Chinese authorities understand Western communication theory and appreciate how that theory can be applied to disseminate messages to both foreign and domestic audiences.
Large-scale stationary hydrogen storage via liquid organic hydrogen carriers
Publisher: Elsevier BV
Date: 09-2021
A TEM, XRD, and crystal chemical investigation of oxygen/vacancy ordering in (Ba1-x Lax )2 In2 O5+x , 0≤x≤0.6
Publisher: Elsevier BV
Date: 02-2003
Observation of short-lived local polar states induced by applied tip biases in BaTiO3-based relaxor ferroelectric ceramics
Publisher: AIP Publishing
Date: 08-07-2013
DOI: 10.1063/1.4813541
An electron diffraction and bond valence sum study of the space group symmetries and structures of the photocatalytic 1:1 ordered A 2 InNbO6 double perovskites ( a =Ca2+, Sr 2+, Ba2+)
Publisher: Elsevier BV
Date: 03-2004
A structure and phase analysis investigation of the “1:1” ordered A2InNbO6 perovskites (A=Ca2+, Sr2+, Ba2+)
Publisher: Elsevier BV
Date: 02-2006
Introduction of TiO2 in CuI for Its Improved Performance as a p-Type Transparent Conductor
Publisher: American Chemical Society (ACS)
Date: 17-06-2019
Abstract: The challenges of making high-performance, low-temperature processed, p-type transparent conductors (TCs) have been the main bottleneck for the development of flexible transparent electronics. Though a few p-type transparent conducting oxides (TCOs) have shown promising results, they need high processing temperature to achieve the required conductivity which makes them unsuitable for organic and flexible electronic applications. Copper iodide is a wide band gap p-type semiconductor that can be heavily doped at low temperature (<100 °C) to achieve conductivity comparable or higher than many of the well-established p-type TCOs. However, as-processed CuI loses its transparency and conductivity with time in an ambient condition which makes them unsuitable for long-term applications. Herein, we propose CuI-TiO
Stacking fault disorder and its diffraction consequences in Ba3MNb2O9 (M=Co and Mn) 1:2 triple perovskites
Publisher: Elsevier BV
Date: 11-2006
A careful phase analysis and TEM investigation of the incommensurately modulated, (Bi 1−x M II )Fe III O 3−x/2 ( M = Ca and Sr), solid solution phases
Publisher: IOP Publishing
Date: 04-2010
Large electrocaloric and pyroelectric energy harvesting effect over a broad temperature range via modulating the relaxor behavior in non-relaxor ferroelectrics
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA03894J
Abstract: Modulating the relaxor ferroelectric–paraelectric phase transition behavior in non-relaxor ferroelectrics via composition design stands for a new strategy for realizing large electrocaloric temperature change over a wide temperature window.
A New n = 4 Layered Ruddlesden–Popper Phase K2.5Bi2.5Ti4O13 Showing Stoichiometric Hydration
Publisher: American Chemical Society (ACS)
Date: 22-01-2016
DOI: 10.1021/ACS.INORGCHEM.5B01913
Abstract: A new bismuth-containing layered perovskite of the Ruddlesden-Popper type, K(2.5)Bi(2.5)Ti4O13, has been prepared by solid-state synthesis. It has been shown to hydrate to form stoichiometric K(2.5)Bi(2.5)Ti4O13·H2O. Diffraction data show that the structure consists of a quadruple-stacked (n = 4) perovskite layer, with potassium ions occupying the rock salt layer and its next-nearest A site. The hydrated s le was shown to remove the offset between stacked perovskite layers relative to the dehydrated s le. Computational methods show that the hydrated phase consists of intact H2O molecules in a vertical "pillared" arrangement bridging across the interlayer space. Rotations of H2O molecules about the c axis were evident in molecular dynamic calculations, which increased in rotation angle with increasing temperature. In situ diffraction data for the dehydrated phase point to a broad structural phase transition from orthorhombic to tetragonal at ∼600 °C. The relative bismuth-rich composition in the perovskite block results in a higher transition temperature compared to related perovskite structures. Water makes a significant contribution to the dielectric constant, which disappears after dehydration.
Interface passivation using ultrathin polymer–fullerene films for high-efficiency perovskite solar cells with negligible hysteresis
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01096F
Abstract: Reducing interface recombination boosts the V oc for perovskite solar cells.
Novel insight into the structure and properties of lead-free dielectric Sr3TiNb4O15
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TC00732B
Abstract: The octahedral tilting approach used in this study will be useful for many more tungsten-bronze-type structures with similar pseudo-symmetry problems.
Morphology, structure, optical, and electrical properties of AgSbO3
Publisher: AIP Publishing
Date: 15-07-2010
DOI: 10.1063/1.3462434
Abstract: The morphology of defect pyrochlore-type, AgSbO3 microparticle/nanoparticles obtained via solid state reaction evolve from irregular to Fullerene-like polyhedra before finally decomposing into metal-organic framework-5 like particles with increase in sintering temperature. The defect pyrochlore-type AgSbO3 particles are slightly Ag deficient while the valence of the antimony ion is shown to be +5 giving rise to a probable stoichiometry of Ag1−xSbVO3−x/2, with x∼0.01–0.04. A highly structured diffuse intensity distribution observed via electron diffraction is interpreted in terms of correlated displacements of one-dimensional (1D) silver ion chains along ⟨110⟩ directions. A redshifting in the absorption edges in UV-visible absorption spectra is observed for s les prepared at sintering temperatures higher than 1000 °C and attributed to the surface plasma resonance effect associated with small amounts of excess metallic Ag on the Ag1−xSbVO3−x/2 particles. An electrical properties investigation of the silver antimonate s les via dielectric, conductivity, and electric modulus spectroscopy shows a prominent dielectric relaxation associated with grain boundaries. The silver ion conductivity is associated with correlated displacements of 1D silver ion chains along ⟨110⟩ directions.
Colossal permittivity with ultralow dielectric loss in In + Ta co-doped rutile TiO2
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6TA08337D
Abstract: Electron-pinned defect dipoles, in the form of highly stable triangle-diamond and/or triangle-linear dopant defect clusters with well defined relative positions for Ti reduction, are present in rutile In + Ta co-doped TiO 2 for the colossal permittivity and low loss.
The temperature-dependent piezoelectric and electromechanical properties of cobalt-modified sodium bismuth titanate
Publisher: Elsevier BV
Date: 02-2016
A general strategy to achieve colossal permittivity and low dielectric loss through constructing insulator/semiconductor/insulator multilayer structures
Publisher: Springer Science and Business Media LLC
Date: 12-06-2018
Dual‐Ion Flux Management for Stable High Areal Capacity Lithium–Sulfur Batteries
Publisher: Wiley
Date: 27-01-2022
Abstract: Controlling the interaction between multiple ion fluxes is a major challenge that h ers the adoption of post‐Li intercalation battery systems, which offer a multifold increase in energy density over existing technologies. Here, a dual‐ion flux management strategy is introduced to simultaneously control the distribution of Li and polysulfide ions in high‐energy Li–S batteries. This approach enables long‐term use of high S‐loading cathodes with 13.6 mg sulfur cm −2 , achieving 9 mAh cm −2 areal capacity with 73% capacity retention for 1000 charging/discharging cycles. The battery system relies on the use of a multiscale membrane, with comparable size to existing battery separators, which simultaneously acts as an atomic redisperser for Li ions, dielectric and mechanical separator, polysulfide barrier, and extended cathode. Combined characterization and modeling reveal that the membrane is stable down to .0 V versus Li + /Li and result in a uniform Li‐ion flux to the anode and effective polysulfide confinement and reutilization. The potential of this approach for application is demonstrated by the fabrication of stable pouch cells with a horizontal surface of 40 cm 2 and 6.8 mAh cm −2 capacity. These findings provide an exemplification of the potential for effective multi‐ion flux management for future energy storage and emerging electrochemical systems.
The Effect of Ta Doping on the Phase Transitions and the Piezoelectric and Ferroelectric Properties of K0.35Na0.65NbO3
Publisher: Informa UK Limited
Date: 2012
Light emission and excitonic effect of boron nitride nanotubes observed by photoluminescent spectra
Publisher: Elsevier BV
Date: 07-2007
Electrospinning induced ferroelectricity in poly(vinylidene fluoride) fibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10467E
Abstract: Poly(vinylidene fluoride) (PVDF) fibers with diameters ranging from 70 to 400 nm are produced by electrospinning and the effect of fiber size on the ferroelectric β-crystalline phase is determined. Domain switching and associated ferro- iezo-electric properties of the electrospun PVDF fibers were also determined. The fibers showed well-defined ferroelectric and piezoelectric properties.
Effect of Electric Field and Temperature on Average Structure and Domain Wall Motion in 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 Ceramic
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/830971
Abstract: In situ neutron powder diffraction patterns and dielectric spectra of 0.93Bi 0.5 Na 0.5 TiO 3 -0.07BaTiO 3 ceramic were investigated under different electrical fields and temperatures. An electric-field-induced phase transition from metrically cubic to metrically tetragonal, associated with strong domain wall motion, occurs. Such induced phase and domain wall motion are unchanged until the high-temperature phase transition occurs from metrically tetragonal to metrically cubic. All these changes are irrelevant to the observed depolarization temperature (75°C). The depolarization behaviour is thus suggested to be associated with the local structure caused by the octahedral tilt twinning disorder.
Electric-field-induced AFE-FE transitions and associated strain/preferred orientation in antiferroelectric PLZST
Publisher: Springer Science and Business Media LLC
Date: 30-03-2016
DOI: 10.1038/SREP23659
Abstract: Electric-field-induced, antiferroelectric-ferroelectric (AFE-FE) phase transitions are common for AFE materials. To date, the strain and preferred orientation evolution as well as the role of the intermediate FE state during the successive AFE-FE-AFE phase transitions has not been clear. To this end, we have herein studied a typical AFE Pb 0.97 La 0.02 (Zr 0.56 Sn 0.33 Ti 0.11 )O 3 (PLZST) material using in-situ neutron diffraction. It is striking that the AFE-FE phase transition is not fully reversible: in the electric-field-induced FE state, the induced strain exhibits an elliptical distribution, which in turn leads to significant preferred orientation in the final AFE state after withdrawal of the applied electric-field. The ω-dependent neutron diffraction patterns show clear evidence of the induced strain distribution and associated preferred orientation arising from the AFE-FE phase transition. The current work also provides an explanation for several temperature and electric-field dependent dielectric anomalies as well as unrecovered strain change which appear in AFE materials after exposure to sufficiently high electric fields.
Comparative first-principles structural and vibrational properties of rutile and anatase TiO2
Publisher: IOP Publishing
Date: 21-09-2023
A combined diffraction and dielectric properties investigation of Ba 3 MnNb2 O9 complex perovskites
Publisher: Elsevier BV
Date: 11-2005
Machine Learning-Enabled Superior Energy Storage in Ferroelectric Films with a Slush-Like Polar State
Publisher: American Chemical Society (ACS)
Date: 24-05-2023
Large Electric Field-Induced Strain and Antiferroelectric Behavior in (1-x)(Na0.5Bi0.5)TiO3-xBaTiO(3) Ceramics
Publisher: American Chemical Society (ACS)
Date: 22-12-2011
DOI: 10.1021/CM102719K
Understanding the Unusual Response to High Pressure in KBe2BO3F2
Publisher: Springer Science and Business Media LLC
Date: 22-06-2017
DOI: 10.1038/S41598-017-04323-2
Abstract: Strong anisotropic compression with pressure on the remarkable non-linear optical material KBe 2 BO 3 F 2 has been observed with the linear compression coefficient along the c axis found to be about 40 times larger than that along the a axis. An unusual non-monotonic pressure response was observed for the a lattice parameter. The derived bulk modulus of 31 ± 1 GPa indicates that KBe 2 BO 3 F 2 is a very soft oxide material yet with stable structure up to 45 GPa. A combination of high-pressure synchrotron powder X-ray diffraction, high-pressure Raman spectroscopy, and Density Functional Theory calculations points to the mechanism for the unusual pressure response being due to the competition between the K-F bond length and K-F-K bond angle and the coupling between the stretching and twisting vibration modes.
Effect of Annealing Temperature on the Morphology and Piezoresponse Characterisation of Poly(vinylidene fluoride-trifluoroethylene) Films via Scanning Probe Microscopy
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/435938
Abstract: Poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE (70/30)) films were synthesized on a gold/glass substrate via spin coating. The films were annealed at a temperature between 125 ∘ C and 180 ∘ C . Nanoscale characterisation of the morphology, polarization switching, and local piezoresponse hysteresis loops of PVDF-TrFE film was studied using a scanning probe microscope (SPM). Ferroelectric switchable domains were identified by piezoresponse force microscopy (PFM) for all films. Small grains, with weak piezoresponse character, were observed for films annealed just above the Curie temperature. Acicular grains were obtained when the annealing temperature approached the melting point and the piezoresponse increased. Annealing above the melting point decreased the piezoresponse and the morphology changed dramatically into plate-like structures.
Switching spectroscopic measurement of surface potentials on ferroelectric surfaces via an open-loop Kelvin probe force microscopy method
Publisher: AIP Publishing
Date: 10-12-2012
DOI: 10.1063/1.4772511
Abstract: We report a method for switching spectroscopy Kelvin probe force microscopy (SS-KPFM). The method is established as a counterpart to switching spectroscopy piezoresponse force microscopy (SS-PFM) in Kelvin probe force microscopy. SS-KPFM yields quantitative information about the surface charge state during a local bias-induced polarization switching process, complementary to the electromechanical coupling properties probed via SS-PFM. Typical ferroelectric s les of a Pb-based relaxor single crystal and a BiFeO3 thin film were investigated using both methods. We briefly discuss the observed surface charging phenomena and their influence on the associated piezoresponse hysteresis loops.
Heterogeneous photocatalytic decomposition of per- and poly-fluoroalkyl substances: A review
Publisher: Informa UK Limited
Date: 28-06-2019
Porous carbon nanotube/polyvinylidene fluoride composite material: Superhydrophobicity/superoleophilicity and tunability of electrical conductivity
Publisher: Elsevier BV
Date: 10-2014
Electrical characteristics of BaTiO3/Bi0.5K0.5TiO3 multilayered thin films synthesized via metalloorganic decomposition
Publisher: Elsevier BV
Date: 16-07-2009
Reversible single crystal-to-single crystal double [2+2] cycloaddition induces multifunctional photo-mechano-electrochemical properties in framework materials
Publisher: Springer Science and Business Media LLC
Date: 04-06-2020
DOI: 10.1038/S41467-020-15510-7
Abstract: Reversible structural transformations of porous coordination frameworks in response to external stimuli such as light, electrical potential, guest inclusion or pressure, amongst others, have been the subject of intense interest for applications in sensing, switching and molecular separations. Here we report a coordination framework based on an electroactive tetrathiafulvalene exhibiting a reversible single crystal-to-single crystal double [2 + 2] photocyclisation, leading to profound differences in the electrochemical, optical and mechanical properties of the material upon light irradiation. Electrochemical and in situ spectroelectrochemical measurements, in combination with in situ light-irradiated Raman spectroscopy and atomic force microscopy, revealed the variable mechanical properties of the framework that were supported using Density Functional Theory calculations. The reversible structural transformation points towards a plethora of potential applications for coordination frameworks in photo-mechanical and photoelectrochemical devices, such as light-driven actuators and photo-valves for targeted drug delivery.
The upper manganese doping limit and its effects on physical properties of lead-free Bi0.5Na0.5TiO3 ceramics
Publisher: Elsevier BV
Date: 08-2018
Evidence of phase coexistence in hydrothermally synthesized K0.5 Na0.5 NbO3 nanofibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA14153G
Abstract: The 2D 23 Na 3QMAS NMR analyses provide new insights into the crystalline structure of K 0.5 Na 0.5 NbO 3 nanostructures on the microscopic scale, which are critical to understand the functional properties of these nano-materials.
The metastable Ni7±xS6, and mixed Ni6±x(S1−ySey)5, phases
Publisher: Elsevier BV
Date: 02-2003
Microwave Dielectric Materials with Defect-Dipole Clusters Induced Colossal Permittivity and Ultra-low Loss
Publisher: American Chemical Society (ACS)
Date: 04-11-2021
An orthophosphate semiconductor with photooxidation properties under visible-light irradiation
Publisher: Springer Science and Business Media LLC
Date: 06-06-2010
DOI: 10.1038/NMAT2780
Abstract: The search for active semiconductor photocatalysts that directly split water under visible-light irradiation remains one of the most challenging tasks for solar-energy utilization. Over the past 30 years, the search for such materials has focused mainly on metal-ion substitution as in In(1-x)Ni(x)TaO(4) and (V-,Fe- or Mn-)TiO(2) (refs 7,8), non-metal-ion substitution as in TiO(2-x)N(x) and Sm(2)Ti(2)O(5)S(2) (refs 9,10) or solid-solution fabrication as in (Ga(1-x)Zn(x))(N(1-x)O(x)) and ZnS-CuInS(2)-AgInS(2) (refs 11,12). Here we report a new use of Ag(3)PO(4) semiconductor, which can harness visible light to oxidize water as well as decompose organic contaminants in aqueous solution. This suggests its potential as a photofunctional material for both water splitting and waste-water cleaning. More generally, it suggests the incorporation of p block elements and alkali or alkaline earth ions into a simple oxide of narrow bandgap as a strategy to design new photoelectrodes or photocatalysts.
Structure-Driven, Ferroelectric Wake-Up Effect for Electrical Fatigue Relief
Publisher: American Chemical Society (ACS)
Date: 29-07-2020
Phase relations in Ba6-3xLn8+2xTi18O54 (Ln = Nd & Sm) electroceramics
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/373079
Abstract: A careful, systematic investigation of Ba 6 − 3 x L n 8 + 2 x Ti 18 O 54 (BLnTss) ceramics has been performed in order to understand the relationship between composition, microstructure evolution, and microwave dielectric properties. In this paper, we report the effects of composition, morphology, and sintering time on the phase relations and properties of BLnTss (Ln = Nd, Nd/Sm, Sm) ceramics. The microwave dielectric properties of the materials are reported in addition to phase characterisation and structural analysis via X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. BLnTss, x = 0.33 , ceramics with high Sm content are found to experience a severe degradation of Qf and changes in τ cf trending, associated with the onset of globular and needle-like grain morphology and a Ba-Ti rich phase. x = 0.67 ceramics with high Nd content are found to exhibit a secondary phase (Nd 2 Ti 2 O 7 ) upon prolonged sintering which resulted in beneficial changes to Qf and τ cf without affecting ε r . Two BLnTss ceramics compositions with near-zero τ cf were successfully synthesised with high Qf and ε r values.
Elastic anomalies due to structural phase transitions in mechanoluminescent SrAl2 O4 :Eu
Publisher: AIP Publishing
Date: 2010
DOI: 10.1063/1.3269723
Abstract: Elastic and anelastic properties of a ceramic s le of elasticoluminescent SrAl2O4:Eu have been characterized as a function of temperature by resonant ultrasound spectroscopy. Both the bulk (K) and shear (G) moduli show changes attributable to the influence of the P6322→P63 (3A)→P21 sequence of structural phase transitions. Softening of K and stiffening of G at the P6322→P63 (3A) transition (Tc≈1135K) is consistent with weak strain/order parameter coupling and tricritical character. In marked contrast, the first order P63 (3A)→P21 transition near 930K is accompanied by stiffening such that G is ∼50% larger at room temperature than the value for a P6322 structure extrapolated directly from high temperatures and K is ∼15% larger. Softening of G at high temperatures is consistent with the existence of a soft acoustic mode. Both the P63 (3A) and P6322 phases show an increasing acoustic dissipation with increasing temperature and there is an additional peak in the dissipation behavior below ∼650K. Landau theory has been used to analyze the overall strain and elastic behavior of SrAl2O4:Eu. The stability of the P21 structure is considered in terms of coupling between order parameters with Γ6 and M2 symmetry, though it could also be stabilized by pairwise coupling of order parameters corresponding to irreps Γ4+M2, Γ4+M3, Γ6+M3, and M2+M3. Twin walls in this material should have interesting properties, which are quite distinct from those of the bulk material and could contribute differently to the elasticoluminescent properties.
Hole-Pinned Defect Clusters for a Large Dielectric Constant up to GHz in Zinc and Niobium Codoped Rutile SnO2
Publisher: American Chemical Society (ACS)
Date: 02-11-2021
Lead magnesium niobate-lead titanate piezoelectric immunosensors
Publisher: Elsevier BV
Date: 09-2010
A temperature-dependent structural investigation of electrical transitions in A3 conb2 o9 perovskites (A=Ca2+, Sr2+, Ba2+)
Publisher: Elsevier BV
Date: 11-2006
Design Synthesis of Nitrogen-Doped TiO2@Carbon Nanosheets toward Selective Nitroaromatics Reduction under Mild Conditions
Publisher: American Chemical Society (ACS)
Date: 20-09-2017
'Soft' phonon modes, structured diffuse scattering and the crystal chemistry of Fe-bearing sphalerites
Publisher: Elsevier BV
Date: 03-2005
Structural transitions in [001]/[111]-oriented 0.26Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 single crystals probed via neutron diffraction and electrical characterization
Publisher: AIP Publishing
Date: 19-04-2013
DOI: 10.1063/1.4802669
Abstract: We report changes in the metric symmetry of unpoled and electrically poled single crystals of 0.26Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.28PbTiO3, as revealed by neutron diffraction in conjunction with electrical measurements. The unpoled crystals show relaxor characteristics and an average rhombohedral symmetry that persists from ambient temperature up to the Curie temperature of ∼165 °C. Poling along a [111] direction enhances the rhombohedral distortion away from cubic metric symmetry but appears not to induce any monoclinic phases. By contrast, the poled [001]-oriented crystal has orthorhombic (or monoclinic MC) metric symmetry at 25 °C. An intermediate transition to a metrically tetragonal phase around 120 °C is confirmed for both poled crystals.
Giant thermally-enhanced electrostriction and polar surface phase in
L
Publisher:
American Physical Society (APS)
Date:
27-04-2018
Publisher: American Physical Society (APS)
Date: 27-04-2018
Cluster chemistry in the solid state: Structured diffuse scattering, oxide/fluoride ordering and polar behaviour in transition metal oxyfluorides
Publisher: Elsevier BV
Date: 2007
Eu-doped boron nitride nanotubes as a nanometer-sized visible-light source
Publisher: Wiley
Date: 16-07-2007
Structure, dielectric and ferroelectric properties of lead-free (Ba,Ca)(Ti,Zr)O3-xBiErO3 piezoelectric ceramics
Publisher: Elsevier BV
Date: 04-2018
Defect structure and property consequence when small Li+ ions meet BaTiO3
Publisher: American Physical Society (APS)
Date: 31-08-2020
Rare-earth doped boron nitride nanotubes
Publisher: Elsevier BV
Date: 2008
Efficient and Stable Wide Bandgap Perovskite Solar Cells through Surface Passivation with Long Alkyl Chain Organic Cations
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA05699A
Abstract: Bromide-containing long alkylammonium chain organic cations effectly passivate defects on 1.72 eV perovskite film surfaces and greatly enhance both the performance and stability of perovskite solar cells.
Magnetic ordering and spin dynamics in the
S = 5 2
Publisher:
American Physical Society (APS)
Date:
09-09-2020
Publisher: American Physical Society (APS)
Date: 09-09-2020
Local crystal chemistry, induced strain and short range order in the cubic pyrochlore (Bi1.5−αZn0.5−β)(Zn0.5−γNb1.5−δ)O(7−1.5α−β−γ−2.5δ) (BZN)
Publisher: Elsevier BV
Date: 2004
Reinvestigation of the photostrictive effect in lanthanum‐modified lead zirconate titanate ferroelectrics
Publisher: Wiley
Date: 29-04-2020
DOI: 10.1111/JACE.17172
Nanoscale localized contacts for high fill factors in polymer-passivated perovskite solar cells
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-01-2021
Abstract: In perovskite solar cells, the insulating nature of passivation layers needed to boost open-circuit voltage also increases the series resistance of the cell and limits the fill factor. Most improvements in power conversion efficiency have come from higher open-circuit voltage, with most fill factor improvements reported for very small-area cells. Peng et al. used a nanostructured titanium oxide electron transport layer to boost the fill factor of larger-area cells (1 square centimeter) to 0.84 by creating local regions with high conductivity. Science , this issue p. 390
A structure, conductivity and dielectric properties investigation of A(3)CoNb(2)O(9) (A = Ca2+, Sr2+, Ba2+) triple perovskites
Publisher: Elsevier BV
Date: 12-2004
Coexistence of ferroelectricity and magnetism in transition-metal-doped n = 3 Aurivillius phases
Publisher: IOP Publishing
Date: 06-12-2007
Atomic-scale control of TiO6 octahedra through solution chemistry towards giant dielectric response
Publisher: Springer Science and Business Media LLC
Date: 10-10-2014
DOI: 10.1038/SREP06582
The local crystal chemistry and dielectric properties of the cubic pyrochlore phase in the Bi2O3-M2+ O-Nb2O5 (M2+ = Ni2+ and Mg2+) systems
Publisher: Elsevier BV
Date: 02-2007
The pyrochlore to ‘defect fluorite’ transition in the Y2(ZryTi1−y)2O7 system and its underlying crystal chemistry
Publisher: Elsevier BV
Date: 12-2004
The disordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi2 O3 -MIIO-Nb2 O5 (M=Mg, Ni) systems
Publisher: Elsevier BV
Date: 09-2007
Centimetre-scale perovskite solar cells with fill factors of more than 86 per cent
Publisher: Springer Science and Business Media LLC
Date: 26-01-2022
DOI: 10.1038/S41586-021-04216-5
Abstract: Owing to rapid development in their efficiency
Self-assembly dynamics and accumulation mechanisms of ultra-fine nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR00877H
Abstract: The self-assembly of nanomaterials into three-dimensional hierarchical structures is a fundamental step impacting a large number of synthetic and natural processes. These range from the scalable fabrication of nano-devices such as batteries, sensors and third generation solar cells to the uptake and accumulation of particulate pollution in the lung alveoli. Here, we show that the Dynamic behavior of ultra-fine particles (UFP < 100 nm) erges significantly from that of sub- and micro equivalents. For freely diffusing bodies, this leads to the formation of stochastically reproducible films that approach the morphology and density of ballistically deposited ones. A novel deposition mechanism and regime are proposed that successfully capture the full spectrum of size-dependent self-assembly dynamics. These findings are a significant step toward the engineering of scalable parallel nano-fabrication approaches, and the understanding of the interaction of unbound nanostructures with their surrounding.
An electron diffraction, XRD and lattice dynamical investigation of the average structure and rigid unit mode (RUM) modes of distortion of microporous AlPO4-5
Publisher: Elsevier BV
Date: 03-2003
Composition-induced antiferroelectric phase and giant strain in lead-free ceramics
Publisher: American Physical Society (APS)
Date: 28-02-2011
High performance magnetostriction of Fe-Cu-Pd ferromagnetic strain glass:Local chemical ordering induced martensitic nanodomains morphology with low modulus
Publisher: Elsevier BV
Date: 02-2023
Soft phonon modes and diffuse scattering in Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 relaxor ferroelectrics
Publisher: Elsevier BV
Date: 12-2018
Synthesis, structure and dielectric properties of the Sr3Ti1−xZrxNb4O15, (0 ≤ x ≤ 1), series of tungsten bronze type compounds
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CE00425A
Abstract: High temperature phase transitions from Pna 2 1 to P 4/ mbm are observed for all compositions, and transition temperatures increase with Zr content.
Chemical Synthesis and High-Pressure Reaction of Nb5+ Monodoped Rutile TiO2 Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 13-05-2020
Displacive disorder and dielectric relaxation in the stoichiometric bismuth-containing pyrochlores, (Bi2MNbO7)-Nb-III (M = In and Sc)
Publisher: Elsevier BV
Date: 10-2009
Large Piezoelectricity and Ferroelectricity in Mn‐Doped (Bi 0.5 Na 0.5 )TiO 3 ‐BaTiO
Publisher: Wiley
Date: 05-04-2016
DOI: 10.1111/JACE.14227
Systematic review of cross-cultural adaptations of McGill Pain Questionnaire reveals a paucity of clinimetric testing
Publisher: Elsevier BV
Date: 09-2009
DOI: 10.1016/J.JCLINEPI.2009.03.019
Abstract: The objectives of this study were to identify the available cross-cultural adaptations of the McGill Pain Questionnaire (MPQ), to describe the clinimetric testing that has occurred for each adaptation and to evaluate both the quality of the adaptation procedures and the clinimetric testing for each version. This study is a systematic review. Searches of the MEDLINE, EMBASE, and CINAHL databases were used to identify relevant studies. Data on the quality of the adaptation procedures and clinimetric testing were extracted using current guidelines. Forty-four different versions of the MPQ were identified representing 26 different languages/cultures. Regardless of the method of cross-cultural adaptation, clinimetric testing of the adapted questionnaires was generally poorly performed and for 18 versions no clinimetric testing has been undertaken. Although the MPQ has been adapted into a large number of languages, because of inadequate testing most of the adaptations have unknown clinimetric properties. This situation means that users should be cautious when interpreting scores from adapted questionnaires.
Structured diffuse scattering and the fundamental 1-d dipolar unit in PLZT (Pb1-yLay)(1-alpha)(Zr1-xTix)(1-beta)O-3 (7.5/65/35 and 7.0/60/40) transparent ferroelectric ceramics
Publisher: Elsevier BV
Date: 02-2009
Photovoltaic Effect of a Ferroelectric-Luminescent Heterostructure under Infrared Light Illumination
Publisher: American Chemical Society (ACS)
Date: 08-08-2018
Abstract: In this report, a ferroelectric-luminescent heterostructure is designed to convert infrared light into electric power. We use BiFeO
Trans-Regime Structural Transition of (In3+ + Nb5+) Co-Doped Anatase TiO2 Nanocrystals under High Pressure
Publisher: American Chemical Society (ACS)
Date: 04-04-2017
Selective separation of oil and water with mesh membranes by capillarity
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.CIS.2016.05.008
Abstract: The separation of oil and water from wastewater generated in the oil-production industries, as well as in frequent oil spillage events, is important in mitigating severe environmental and ecological damage. Additionally, a wide arrange of industrial processes require oils or fats to be removed from aqueous systems. The immiscibility of oil and water allows for the wettability of solid surfaces to be engineered to achieve the separation of oil and water through capillarity. Mesh membranes with extreme, selective wettability can efficiently remove oil or water from oil/water mixtures through a simple filtration process using gravity. A wide range of different types of mesh membranes have been successfully rendered with extreme wettability and applied to oil/water separation in the laboratory. These mesh materials have typically shown good durability, stability as well as reusability, which makes them promising candidates for an ever widening range of practical applications.
Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion
Publisher: American Chemical Society (ACS)
Date: 06-07-2021
DOI: 10.1021/ACS.CHEMREV.0C01328
Abstract: Global energy and environmental crises are among the most pressing challenges facing humankind. To overcome these challenges, recent years have seen an upsurge of interest in the development and production of renewable chemical fuels as alternatives to the nonrenewable and high-polluting fossil fuels. Photocatalysis, photoelectrocatalysis, and electrocatalysis provide promising avenues for sustainable energy conversion. Single- and dual-component catalytic systems based on nanomaterials have been intensively studied for decades, but their intrinsic weaknesses h er their practical applications. Multicomponent nanomaterial-based systems, consisting of three or more components with at least one component in the nanoscale, have recently emerged. The multiple components are integrated together to create synergistic effects and hence overcome the limitation for outperformance. Such higher-efficiency systems based on nanomaterials will potentially bring an additional benefit in balance-of-system costs if they exclude the use of noble metals, considering the expense and sustainability. It is therefore timely to review the research in this field, providing guidance in the development of noble-metal-free multicomponent nanointegration for sustainable energy conversion. In this work, we first recall the fundamentals of catalysis by nanomaterials, multicomponent nanointegration, and reactor configuration for water splitting, CO
Above-Band Gap Photoinduced Stabilization of Engineered Ferroelectric Domains
Publisher: American Chemical Society (ACS)
Date: 09-03-2018
Abstract: The effect of above-band gap photons on the domains of the BiFeO
Over 1.0mm-long boron nitride nanotubes
Publisher: Elsevier BV
Date: 09-2008
Role of A-Site Molecular Ions in the Polar Functionality of Metal–Organic Framework Perovskites
Publisher: American Chemical Society (ACS)
Date: 13-12-2021
Ferroelastic aspects of relaxor ferroelectric behaviour in Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 perovskite
Publisher: AIP Publishing
Date: 25-03-2013
DOI: 10.1063/1.4794027
Abstract: Elastic and anelastic properties of poled and depoled single crystals of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 with compositions close to the morphotropic boundary have been investigated over the temperature range 5–700 K by resonant ultrasound spectroscopy (RUS) at frequencies of 0.1–1.2 MHz. Steep elastic softening occurs in a temperature interval of at least 250 K as the Vogel-Fulcher freezing interval and cubic → tetragonal transition point, Tc, are approached from above. This is understood in terms of coupling between acoustic modes and central peak mode(s) associated with dynamic polar nano regions (PNR's) below the Burns temperature. Acoustic losses occur in a temperature interval of ∼50 K above Tc, associated with slowing down of the PNR dynamics. The cubic ↔ tetragonal and tetragonal ↔ rhombohedral transitions are accompanied by steep minima in elastic properties, closely analogous to the pattern of softening and stiffening observed in sequences of improper ferroelastic transitions in other perovskites. Variations in the magnitudes of acoustic losses at T & Tc correlate with the density of ferroelastic twin walls, from lowest for [001]c-poled and [111]c-poled crystals in the stability fields of the tetragonal and rhombohedral phases, respectively, to highest for unpoled crystals. A simple model of Debye-like peaks in acoustic loss near 100 K has yielded activation energies and attempt frequencies in the same range as those observed from dielectric data in the Vogel-Fulcher freezing interval. These highlight the fact that, in addition to conventional ferroelectric/ferroelastic twin walls, relaxor ferroelectrics contain local structural heterogeneities coupled to strain, which are probably related to the presence of static PNR's preserved even in poled crystals. RUS also provides a convenient and effective means of determining the mechanical quality factor of relaxor ferroelectrics, as functions of both poling history and temperature.
Piezoelectric Responses of Mechanically Exfoliated Two-Dimensional SnS2 Nanosheets
Publisher: American Chemical Society (ACS)
Date: 03-11-2020
Structurally frustrated polar nanoregions in BaTaO2 N and the relationship between its high dielectric permittivity and that of BaTiO 3
Publisher: AIP Publishing
Date: 10-03-2008
DOI: 10.1063/1.2890052
Abstract: This letter presents direct evidence for the existence of the same inherently polar one-dimensional (1D), displacive disorder in BaTaO2N as occurs in paraelectric BaTiO3 as well as in doped BaTiO3 relaxor ferroelectric systems. The inherently polar, off-center and oppositely directed displacements of Ta and neighboring O∕N ions along ⟨001⟩ give rise to 1D polar nanoregions (PNRs) and are responsible for the dielectric properties of BaTaO2N. A bond valence sum analysis of the underlying crystal chemistry of BaTaO2N shows clearly that O∕N ordering is not directly responsible for inducing the observed 1D PNRs.
Nanoscale investigation of ferroelectric properties in electrospun barium titanate/polyvinylidene fluoride composite fibers using piezoresponse force microscopy
Publisher: Elsevier BV
Date: 07-2011
Electron-pinned defect-dipoles for high-performance colossal permittivity materials
Publisher: Springer Science and Business Media LLC
Date: 30-06-2013
DOI: 10.1038/NMAT3691
Abstract: The immense potential of colossal permittivity (CP) materials for use in modern microelectronics as well as for high-energy-density storage applications has propelled much recent research and development. Despite the discovery of several new classes of CP materials, the development of such materials with the required high performance is still a highly challenging task. Here, we propose a new electron-pinned, defect-dipole route to ideal CP behaviour, where hopping electrons are localized by designated lattice defect states to generate giant defect-dipoles and result in high-performance CP materials. We present a concrete ex le, (Nb+In) co-doped TiO₂ rutile, that exhibits a largely temperature- and frequency-independent colossal permittivity (> 10(4)) as well as a low dielectric loss (mostly < 0.05) over a very broad temperature range from 80 to 450 K. A systematic defect analysis coupled with density functional theory modelling suggests that 'triangular' In₂(3+)Vo(••)Ti(3+) and 'diamond' shaped Nb₂(5+)Ti(3+)A(Ti) (A = Ti(3+)/In(3+)/Ti(4+)) defect complexes are strongly correlated, giving rise to large defect-dipole clusters containing highly localized electrons that are together responsible for the excellent CP properties observed in co-doped TiO₂. This combined experimental and theoretical work opens up a promising feasible route to the systematic development of new high-performance CP materials via defect engineering.
Temperature-dependent electrical, elastic and magnetic properties of sol–gel synthesized Bi0.9Ln0.1FeO3(Ln = Nd, Sm)
Publisher: IOP Publishing
Date: 28-02-2012
DOI: 10.1088/0953-8984/24/12/125901
Abstract: This report details correlated electrical, mechanical and magnetic behaviour in BiFeO(3) ceramics doped with 10% Ln (Ln = Sm, Nd) ions on the Bi, or perovskite A, site and synthesized by a sol-gel method. The ceramics exhibit bulk piezoelectric and ferroelectric properties and clear ferroelectric domain patterns through piezoresponse force microscopy. Resonant ultrasound spectroscopy, dielectric spectroscopy and magnetometry studies show correlated magnetoelectromechanical behaviour and the existence of weak ferromagnetism for both compositions. An anomaly with simultaneous mechanical and magnetic signatures is discovered in both materials near room temperature, while previously reported transitions and anomalies are found to exhibit electro- and/or magnetomechanical coupling. Magnetism is significantly enhanced in the Sm doped s le, which is a promising multiferroic material.
Study of the B -site ion behaviour in the multiferroic perovskite bismuth iron chromium oxide
Publisher: AIP Publishing
Date: 17-04-2018
DOI: 10.1063/1.5020305
Abstract: A simple, near-ambient pressure solid-state method was developed to nominally synthesize BiFe0.5Cr0.5O3. The procedure allowed the gram-scale production of multiferroic s les with appreciable purity and large amounts of Cr incorporation that were suitable for systematic structural investigation by neutron, X-ray, and electron diffraction in tandem with physical characterization of magnetic and ferroelectric properties. The rhombohedrally distorted perovskite phase was assigned to the space group R3c by way of X-ray and neutron powder diffraction analysis. Through a combination of magnetometry and muon spin relaxation, it is evident that there is magnetic ordering in the BFCO phase consistent with G-type antiferromagnetism and a TN ∼ 400 K. There is no clear evidence for chemical ordering of Fe and Cr in the B-site of the perovskite structure and this result is rationalized by density functional theory and bond valence simulations that show a lowered energy associated with a B-site disordered structure. We believe that our contribution of a new, low-complexity method for the synthesis of BFO type s les, and dialogue about realising certain types of ordering in oxide perovskite systems, will assist in the further development of multiferroics for next-generation devices.
Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)xTi1-xO2
Publisher: Springer Science and Business Media LLC
Date: 30-08-2017
DOI: 10.1038/S41598-017-08992-X
Abstract: This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg 2+ , Ta 5+ ) co-doped rutile TiO 2 polycrystalline ceramics with nominal compositions of (Mg 2+ 1/3 Ta 5+ 2/3 ) x Ti 1− x O 2 . Colossal permittivity ( ) with a low dielectric loss (e.g. 0.002 at 1 kHz) across a broad frequency/temperature range can be achieved at x = 0.5% after careful optimization of process conditions. Both experimental and theoretical evidence indicates such a colossal permittivity and low dielectric loss intrinsically originate from the intragrain polarization that links to the electron-pinned $${\\bf{M}}{{\\bf{g}}}_{{\\bf{T}}{\\bf{i}}}^{{\\prime}{\\prime} }+{{\\bf{V}}}_{{\\bf{O}}}^{\\bullet \\bullet }+{\\bf{2}}{\\bf{T}}{{\\bf{a}}}_{{\\bf{T}}{\\bf{i}}}^{\\bullet }+{\\bf{2}}{\\bf{T}}{{\\bf{i}}}_{{\\bf{T}}{\\bf{i}}}^{\\prime}$$ M g T i ′ ′ + V O • • + 2 T a T i • + 2 T i T i ′ defect clusters with a specific configuration, different from the defect cluster form previously reported in tri- ent-valent ion co-doped rutile TiO 2 . This work extends the research on colossal permittivity and defect formation to bi- enta-valent ion co-doped rutile TiO 2 and elucidates a likely defect cluster model for this system. We therefore believe these results will benefit further development of colossal permittivity materials and advance the understanding of defect chemistry in solids.
In-situ neutron diffraction study of Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 single crystals under uniaxial mechanical stress
Publisher: AIP Publishing
Date: 15-04-2012
DOI: 10.1063/1.4706563
Abstract: In this paper, we report the phase transition behavior of ternary relaxor ferroelectric single crystals of 0.25Pb(In1/2Nb1/2)O3-0.44Pb(Mg1/3Nb2/3)O3-0.31PbTiO3 subject to a uniaxial mechanical stress up to 400 MPa. The resultant in situ neutron diffraction data are interpreted in terms of the polarization rotation theory and provide direct structural evidence for the stress-induced polarization rotation pathway deduced from studies of macroscopic physical properties under stress. It is suggested that an intermediate, metastable orthorhombic phase is induced above a critical pressure of ∼75 MPa. This critical stress level appears to be unaffected by s le poling although the ground states (at zero stress) for the poled and unpoled crystals are different. The critical stress level, however, does decrease with increasing temperature. The elastic behavior of the intermediate phases is also studied based on a calculation of the associated lattice strains.
Susceptible Ferroelectric/Antiferroelectric Phase Transition near the Surface of Nb-Doped Lead Zirconate Stannate Titanate from Surface Processing
Publisher: American Chemical Society (ACS)
Date: 02-06-2016
Abstract: This work systematically investigated the structure and property of the near-surface and bulk regions of Pb0.99(Nb0.02Zr0.73Sn0.21Ti0.04)O3 ceramics using a combination of X-ray and neutron diffraction, piezoresponse force microscopy, and conventional ferroelectric iezoelectric characterization. It is found that mechanical force can induce an antiferroelectric/ferroelectric phase transition within micrometers of the surface. Such a phase transition is strongly dependent on the processing scenario, leading to differences from the bulk region. This work provides crucial insights into the sensitivity of this class of AFE materials. Clearly, surface processing conditions must be taken into account for both accurate structural determination and practical applications.
BiOBr Micro–Nanosheets: Controllable Synthesis and Piezoelectric and Photoelectric Properties
Publisher: American Chemical Society (ACS)
Date: 11-11-2021
Colossal Dielectric Permittivity in (Nb+Al) Codoped Rutile TiO 2 Ceramics: Compositional Gradient and Local Structure
Publisher: American Chemical Society (ACS)
Date: 14-07-2015
Multi‐Functional Atomically Thin Oxides from Bismuth Liquid Metal
Publisher: Wiley
Date: 19-09-2023
The formation of defect-pairs for highly efficient visible-light catalysts
Publisher: Wiley
Date: 23-01-2017
Structure, dielectric and ferroelectric properties of lead free (K,Na)(Nb)O3-xBiErO3 piezoelectric ceramics
Publisher: Springer Science and Business Media LLC
Date: 02-2018
High performance bulk photovoltaics in narrow-bandgap centrosymmetric ultrathin films
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9MH01744E
Abstract: Intensive bulk photovoltaic effects are produced in narrow-bandgap centrosymmetric materials by a new strategy based on polar nano-regions.
Ferroelectric Domain Engineered Photochemical Deposition for Area-Selectable Broadband Enhancement of Quantum Dot Photoluminescence
Publisher: Wiley
Date: 09-08-2013
Detailed Phase Analysis and Crystal Structure Investigation of a Bi1-xCaxFeO3-x/2 Perovskite-Related Solid Solution Phase and Selected Property Measurements Thereof
Publisher: American Chemical Society (ACS)
Date: 24-08-2009
DOI: 10.1021/CM901757H
A correlated electron diffraction, in situ neutron diffraction and dielectric properties investigation of poled (1-x)Bi0.5 Na 0.5 TiO3 -xBaTiO3 ceramics
Publisher: AIP Publishing
Date: 15-10-2011
DOI: 10.1063/1.3654140
Abstract: A correlated electron diffraction, temperature-dependent in situ neutron diffraction, and temperature-dependent dielectric properties investigation of poled (1-x)Bi0.5Na0.5TiO3-xBaTiO3 (BNTBT100x) (x = 0.04, 0.07, and 0.12) s les has been carried out. The results show that the depolarization temperature, Td, of the rhombohedral BNTBT 4 s le is associated with the disappearance of G ± ½ [111]*p satellite reflections and a-a-a- octahedral tilting while that of the BNTBT 12 s le is associated with a metrically tetragonal to metrically cubic or pseudo-cubic symmetry. In the case of the poled BNTBT 7 s le in the MPB region, the dielectric properties show a quite distinct two stage transition from a room temperature clearly metrically tetragonal phase again to a metrically cubic or pseudo-cubic symmetry above 150 °C. There is no apparent change in its average structure in vicinity of Td in BNTBT 7. Electron diffraction shows the presence of considerable octahedral tilt twin disorder in all three s les.
Structural disorder in BZN-based pyrochlores
Publisher: Springer Science and Business Media LLC
Date: 13-09-2008
Structurally frustrated relaxor ferroelectric behavior in CaCu3Ti4O12
Publisher: American Physical Society (APS)
Date: 07-10-2005
Janus Conductive/Insulating Microporous Ion-Sieving Membranes for Stable Li–S Batteries
Publisher: American Chemical Society (ACS)
Date: 04-09-2020
Sillen–Aurivillius Intergrowth Phases as Templates for Naturally Layered Multiferroics
Publisher: American Chemical Society (ACS)
Date: 10-10-2012
DOI: 10.1021/CM302342V
Critical role of the coupling between the octahedral rotation and A-site ionic displacements in PbZrO3-based antiferroelectric materials investigated by in situ neutron diffraction
Publisher: American Physical Society (APS)
Date: 21-12-2017
LOCAL MICROSTRUCTURE EVOLUTION OF BISMUTH SODIUM TITANATE-BASED LEAD-FREE PIEZOELECTRIC SYSTEMS ACROSS THE MORPHOTROPIC PHASE BOUNDARY REGION
Publisher: World Scientific Pub Co Pte Lt
Date: 10-2012
DOI: 10.1142/S2010135X12300125
Abstract: Morphotropic phase boundary (MPB) containing piezoelectric systems generally exhibit enhanced piezoelectric performance at compositions within, or close to, the MPB region. The mechanism/s underlying such enhancement, however, are still contentious due to complex micro/nanostructure and apparently inherent local structural variability associated with octahedral tilt disorder latelet precipitates in such piezoelectric materials. This paper reviews some recent structural analysis results from Bi 0.5 Na 0.5 TiO 3 (BNT) and other binary, lead-free, piezoelectric materials systems derived from it via electron diffraction and in situ neutron diffraction. The results suggest that intrinsically existing local microstructure (LMS) in BNT essentially continues across the MPB region. The LMS, originating from inherent octahedral tilt disorder, is strongly temperature-, electric field-, pressure- and chemical composition-dependent, and may help to explain a series of phenomena observed in BNT-based binary materials systems, including the enhanced piezoelectric effect in the region of the MPB.
Lead-free (Ag,K)NbO 3 materials for high-performance explosive energy conversion
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-05-2020
Abstract: A lead-free material with better performance was developed to replace the commercially used material for energy conversion.
A two-step approach towards solar-driven water splitting
Publisher: Elsevier BV
Date: 2011
Crystal chemistry on a lattice: The case of BZN and BZN-related pyrochlores
Publisher: Elsevier BV
Date: 07-2006
Ferroelectric memristor based on Pt/BiFeO3/Nb-doped SrTiO3 heterostructure
Publisher: AIP Publishing
Date: 11-03-2013
DOI: 10.1063/1.4795145
Abstract: We report a continuously tunable resistive switching behavior in Pt/BiFeO3/Nb-doped SrTiO3 heterostructure for ferroelectric memristor application. The resistance of this memristor can be tuned up to 5 × 105% by applying voltage pulses at room temperature, which exhibits excellent retention and anti-fatigue characteristics. The observed memristive behavior is attributed to the modulation effect of the ferroelectric polarization reversal on the width of depletion region and the height of potential barrier of the p-n junction formed at the BiFeO3/Nb-doped SrTiO3 interface.
Robust Thermal Neutron Detection by LiInP2Se6 Bulk Single Crystals
Publisher: Wiley
Date: 27-04-2023
Abstract: Direct neutron detection based on semiconductor crystals holds promise to transform current neutron detector technologies and further boosts their widespread applications. It is, however, long impeded by the dearth of suitable materials in the form of sizeable bulk crystals. Here, high‐quality centimeter‐sized LiInP 2 Se 6 single crystals are developed using the Bridgman method and their structure and property characteristics are systematically investigated. The prototype detectors fabricated from the crystals demonstrate an energy resolution of 53.7% in response to α ‐particles generated from an 241 Am source and robust, well‐defined response spectra to thermal neutrons that exhibit no polarization or degradation effects under prolonged neutron/ γ ‐ray irradiation. The primary mechanisms of Se‐vacancy and In Li antisite defects in the carrier trapping process are also identified. Such insights are critical for further enhancing the energy resolution of LiInP 2 Se 6 bulk crystals toward the intrinsic level (≈8.6% as indicated by the chemical vapor transport‐grown thin crystals). These results pave the way for practically adopting LiInP 2 Se 6 single crystals in new‐generation solid‐state neutron detectors.
A new avenue to relaxor-like ferroelectric behaviour found by probing the structure and dynamics of [NH3NH2]Mg(HCO2)3
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TC00480E
Abstract: Analysis of the average and local structure in (NH 3 NH 2 )Mg(HCO 2 ) 3 reveals a new source of relaxor ferroelectric like behaviour in a hybrid framework.
Bimetallic Ions Codoped Nanocrystals: Doping Mechanism, Defect Formation, and Associated Structural Transition
Publisher: American Chemical Society (ACS)
Date: 05-07-2017
Anomalous Photovoltaic Effect in Centrosymmetric Ferroelastic BiVO 4
Publisher: Wiley
Date: 14-09-2018
Abstract: The anomolous photovoltaic (APV) effect is an intriguing phenomenon and rarely observed in bulk materials that structurally have an inversion symmetry. Here, the discovery of such an APV effect in a centrosymmetric vanadate, BiVO
Magnetic structure and spin correlations in magnetoelectric honeycomb
M
Publisher:
American Physical Society (APS)
Date:
22-10-2018
Publisher: American Physical Society (APS)
Date: 22-10-2018
Nanoscale TiO2 Coatings Improve the Stability of an Earth-Abundant Cobalt Oxide Catalyst during Acidic Water Oxidation
Publisher: American Chemical Society (ACS)
Date: 15-07-2022
Rigid unit modes (RUMs) of distortion, local crystal chemistry and the inherent displacive flexibility of microporous AlPO4 -11
Publisher: Elsevier BV
Date: 05-2003
Raman spectra, photoluminescence and dielectric relaxation in Bi 1.5 ZnNb1.5 O7 pyrochlore
Publisher: Elsevier BV
Date: 05-2011
Ferroelectric Ceramics for Pyroelectric Detection Applications: A Review
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2021
Temperature Dependence of Electrical Properties and Crystal Structure of 0.29Pb(In1/2Nb1/2)O3–0.44Pb(Mg1/3Nb2/3)O3–0.27PbTiO3
Publisher:
Hindawi Limited
Date:
2013
DOI:
10.1155/2013/382140
Abstract: We characterized the temperature dependent ( ~ 25–200°C) electromechanical properties and crystal structure of Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 single crystals using in situ electrical measurement and neutron diffraction techniques. The results show that the poled crystal experiences an addition phase transition around 120°C whereas such a transition is absent in the unpoled crystal. It is also found that the polar order persists above the maximum dielectric permittivity temperature at which the crystal shows a well-defined antiferroelectric behavior. The changes in the electrical properties and underlying crystal structure are discussed in the paper.
Energy and temperature dependence of rigid unit modes in AlPO 4 -5
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP01723H
Abstract: Rigid unit modes are shown to be dynamic within the AlPO 4 -5 structure down to low temperatures where the static time-averaged structure cannot provide a true physical solution.
Defect engineering for creating and enhancing bulk photovoltaic effect in centrosymmetric materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA02699B
Abstract: A defect-engineering strategy is reported to enhance the photovoltaic performance of BiNbO 4 . Synergetic effects: enhanced light absorption, ferroelectric-like depolarization and interfacial polarization on BiNbO 4 homojunction lead to an increase in the photovoltaic effects.
Dipolar-glass-like relaxor ferroelectric behaviour in the 0.5BaTiO 3-0.5Bi(Mg1/2Ti1/2)O3 electroceramic
Publisher: AIP Publishing
Date: 22-07-2013
DOI: 10.1063/1.4816741
Abstract: In this study, the dielectric and ferroelectric switching behaviour of 0.5BaTiO3-0.5Bi(Mg1/2Ti1/2)O3 (BT-BMT) ceramics are investigated. The BT-BMT ceramic exhibits a typical dipolar-glass-like, dielectric polarisation relaxation. This is attributed to the 15 distinct possible local A4B2 configurations around the O ions and the effect this unavoidable local compositional variability has on the dipole relaxation behaviour of inherent 1-D ⟨111⟩ dipole chains, arising from correlated off-centre displacements of Bi3+ and Ti4+ ions along local ⟨111⟩ directions. On the other hand, switchable polarisation under strong applied electric fields is observed on different length scales accompanied by the appearance of strong polarisation relaxation, as observed via time-delayed piezoresponse hysteresis loop measurements. These experimental results demonstrate that this BT-BMT ceramic is relaxor ferroelectric in nature, although it exhibits dipolar-glass-like dielectric relaxation behaviour.
Colossal Dielectric Behavior of Ga+Nb Co-Doped Rutile TiO 2
Publisher: American Chemical Society (ACS)
Date: 06-11-2015
Abstract: Stimulated by the excellent colossal permittivity (CP) behavior achieved in In+Nb co-doped rutile TiO2, in this work we investigate the CP behavior of Ga and Nb co-doped rutile TiO2, i.e., (Ga(0.5)Nb(0.5))(x)Ti(1-x)O2, where Ga(3+) is from the same group as In(3+) but with a much smaller ionic radius. Colossal permittivity of up to 10(4)-10(5) with an acceptably low dielectric loss (tan δ = 0.05-0.1) over broad frequency/temperature ranges is obtained at x = 0.5% after systematic synthesis optimizations. Systematic structural, defect, and dielectric characterizations suggest that multiple polarization mechanisms exist in this system: defect dipoles at low temperature (∼10-40 K), polaronlike electron hopping/transport at higher temperatures, and a surface barrier layer capacitor effect. Together these mechanisms contribute to the overall dielectric properties, especially apparent observed CP. We believe that this work provides comprehensive guidance for the design of new CP materials.
Nano-Imprinted Ferroelectric Polymer Nanodot Arrays for High Density Data Storage
Publisher: Wiley
Date: 17-01-2013
Humidity sensing properties of single Au-decorated boron nitride nanotubes
Publisher: Elsevier BV
Date: 05-2013
K0.46Na0.54NbO3 ferroelectric ceramics: chemical synthesis, electro-mechanical characteristics, local crystal chemistry and elastic anomalies
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0DT01666G
Abstract: K(0.46)Na(0.54)NbO(3) ceramics have been fabricated via a chemical synthesis route. It was found that 500 °C heat treatment is sufficient to crystallize the niobate powder and the ceramic sintered at 1080 °C in air shows good ferroelectric and piezoelectric properties (P(r) ~ 15 μC cm(-2), d(33) ~ 120 pC N(-1)). Electron diffraction patterns not only determine the space group symmetry of Pcm2(1) for the first time, but also reveal structural disorder in K(0.46)Na(0.54)NbO(3), and 1-D correlated strings of Nb-O atomic displacements are suggested to account for the polar behaviour. Elastic constants such as the bulk and shear moduli as well as their evolution with temperature were also measured using the resonant ultrasound spectroscopy method.
Domain-selective photochemical reaction on oriented ferroelectric Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystals
Publisher: Elsevier BV
Date: 2013
Structured diffuse scattering and polar nano-regions in the Ba(Ti1-xSnx)O-3 relaxor ferroelectric system
Publisher: Elsevier BV
Date: 03-2007
Cubic perovskite-related phases in the ternary SrO-CuO-Nb2O5 system
Publisher: Elsevier BV
Date: 09-2004
Photoactivity and Stability Co‐Enhancement: When Localized Plasmons Meet Oxygen Vacancies in MgO
Publisher: Wiley
Date: 17-10-2018
Abstract: Durability is still one of the key obstacles for the further development of photocatalytic energy-conversion systems, especially low-dimensional ones. Encouragingly, recent studies show that nanoinsulators such as SiO
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