ORCID Profile
0000-0002-3163-9320
Current Organisations
Neuroscience Research Australia
,
China Spallation Neutron Source
,
Institute of High Energy Physics, Chinese Academy of Sciences
,
UNSW Sydney
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Composite and Hybrid Materials | Functional Materials | Materials Engineering
Publisher: American Chemical Society (ACS)
Date: 12-02-2018
Publisher: AIP Publishing
Date: 23-01-2015
DOI: 10.1063/1.4906437
Abstract: The structural properties of Mn0.92Fe0.08CoGe have been investigated in detail using synchrotron x-ray diffraction in zero and applied pressure (p = 0–10 GPa). A ferromagnetic transition occurs around TC = 300 K and a large magnetic-entropy change −ΔSM = 17.3 J/kg K detected at TC for a field change of ΔB = 5 T. The field dependence of −ΔSMmax can be expressed as −ΔSMmax ∝ B. At ambient temperature and pressure, Mn0.92Fe0.08CoGe exhibits a co-existence of the orthorhombic TiNiSi-type structure (space group Pnma) and hexagonal Ni2In-type structure (space group P63/mmc). Application of external pressure drives a structure change from the orthorhombic TiNiSi-type structure to the hexagonal Ni2In-type structure. A large anomaly in heat capacity around TC is detected and the Debye temperature θD (=319(±10) K) has been derived from analyses of the low temperature heat capacity, T ≲ 10 K.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 05-2013
Publisher: Springer Science and Business Media LLC
Date: 18-05-2023
Publisher: Springer Science and Business Media LLC
Date: 20-07-2021
DOI: 10.1038/S41467-021-24697-2
Abstract: Li-ion-conducting chloride solid electrolytes receive considerable attention due to their physicochemical characteristics such as high ionic conductivity, deformability and oxidative stability. However, the raw materials are expensive, and large-scale use of this class of inorganic superionic conductors seems unlikely. Here, a cost-effective chloride solid electrolyte, Li 2 ZrCl 6 , is reported. Its raw materials are several orders of magnitude cheaper than those for the state-of-the-art chloride solid electrolytes, but high ionic conductivity (0.81 mS cm –1 at room temperature), deformability, and compatibility with 4V-class cathodes are still simultaneously achieved in Li 2 ZrCl 6 . Moreover, Li 2 ZrCl 6 demonstrates a humidity tolerance with no sign of moisture uptake or conductivity degradation after exposure to an atmosphere with 5% relative humidity. By combining Li 2 ZrCl 6 with the Li-In anode and the single-crystal LiNi 0.8 Mn 0.1 Co 0.1 O 2 cathode, we report a room-temperature all-solid-state cell with a stable specific capacity of about 150 mAh g –1 for 200 cycles at 200 mA g –1 .
Publisher: American Chemical Society (ACS)
Date: 06-05-2019
Abstract: Compounds that exhibit the unique behavior of negative thermal expansion (NTE)-the physical property of contraction of the lattice parameters on warming-can be applied widely in modern technologies. Consequently, the search for and design of an NTE material with operational and controllable qualities at room temperature are important topics in both physics and materials science. In this work, we demonstrate a new route to achieve magnetic manipulation of a giant NTE in (Mn
Publisher: Wiley
Date: 29-11-2014
Publisher: Research Square Platform LLC
Date: 19-07-2021
DOI: 10.21203/RS.3.RS-699516/V1
Abstract: To date, thermoelectric materials research stays focused on optimizing the material’s band edge details and disfavors low mobility. Here, we shifts the paradigm from the band edge to the mobility edge, exploring high thermoelectricity near the border of band conduction and hopping. Through co-alloying iodine and sulfur, we modularize the plain crystal structure of liquid-like thermoelectric material Cu 2 Te with mosaic nanodomains and the highly size mismatched S/Te sublattice that chemically quenches the Cu sublattice and drives the electronic states from itinerant to localized. A state-of-the-art figure of merit of 1.4 is obtained at 850 K for Cu 2 (S 0.4 I 0.1 Te 0.5 ) and remarkably, it is achieved near the Mott-Ioffe-Regel limit unlike mainstream thermoelectric materials that are band conductors. Broadly, pairing structural modularization with the high performance near the Mott-Ioffe-Regel limit paves an important new path towards the rational design of high-performance thermoelectric materials. Thermoelectric (TE) material-based energy conversion technology has attracted increasing global attention in virtue of the technical merits such as no moving parts, no greenhouse emission, noiseless, friendliness for miniaturization, and reliability. 1–4 Based on the Seebeck and Peltier effects, thermoelectricity enables a direct energy conversion between temperature difference and electricity. 5, 6 The performance of a TE material is primarily gauged by the material’s figure of merit, zT = S 2 T / ρκ , where S is the Seebeck coefficient, T is the absolute temperature, ρ is the electrical resistivity, and κ is the total thermal conductivity (consisting of the lattice thermal conductivity κ L and the electronic thermal conductivity κ E ).
Publisher: Elsevier BV
Date: 09-2023
Publisher: Springer Science and Business Media LLC
Date: 04-04-2017
DOI: 10.1038/SREP45814
Abstract: The Tb 1−x Y x Mn 2 Ge 2 series (x = 0, 0.1, 0.2) compounds are found to exhibit two magnetic phase transitions with decreasing temperature: from the paramagnetic state to the antiferromagnetic interlayer state at T N inter and from an antiferromagnetic interlayer structure to a collinear ferrimagnetic interlayer structure at T C inter . Compared with the slight change of T N inter (409 K, 410 K and 417 K for x = 0, 0.1 and 0.2 respectively), the replacement of Y for Tb leads to a significant decrease in T C inter from 97.5 K for x = 0 to 74.6 K for x = 0.2. The variation in T C inter can be ascribed to the combination of two effects: (1) chemical pressure and (2) magnetic dilution effect by Y substitution for Tb. Besides, a strong anisotropic magnet-volume effect has been detected around T C inter in all compounds with Δa/a = 0.125%, 0.124% and 0.130% for x = 0, 0.1 and 0.2, respectively while no obvious effect is detected along the c-axis. The maximum magnetic entropy change were found to be −ΔS max = 9.1 J kg −1 K −1 , 11.9 J kg −1 K −1 and 6.3 J kg −1 K −1 with a field change from 0 T to 5 T for x = 0, 0.1, 0.2 respectively.
Publisher: American Physical Society (APS)
Date: 26-07-2019
Publisher: Elsevier BV
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 19-06-2020
DOI: 10.1038/S41467-020-16913-2
Abstract: Chemical doping is one of the most important strategies for tuning electrical properties of semiconductors, particularly thermoelectric materials. Generally, the main role of chemical doping lies in optimizing the carrier concentration, but there can potentially be other important effects. Here, we show that chemical doping plays multiple roles for both electron and phonon transport properties in half-Heusler thermoelectric materials. With ZrNiSn-based half-Heusler materials as an ex le, we use high-quality single and polycrystalline crystals, various probes, including electrical transport measurements, inelastic neutron scattering measurement, and first-principles calculations, to investigate the underlying electron-phonon interaction. We find that chemical doping brings strong screening effects to ionized impurities, grain boundary, and polar optical phonon scattering, but has negligible influence on lattice thermal conductivity. Furthermore, it is possible to establish a carrier scattering phase diagram, which can be used to select reasonable strategies for optimization of the thermoelectric performance.
Publisher: IOP Publishing
Date: 29-03-2016
Publisher: Springer Science and Business Media LLC
Date: 17-08-2023
Publisher: Society for Neuroscience
Date: 12-10-2021
DOI: 10.1523/JNEUROSCI.1202-21.2021
Abstract: Recognition memory provides the ability to distinguish familiar from novel objects and places, and is important for recording and updating events to guide appropriate behavior. The hippoc us (HPC) and medial prefrontal cortex (mPFC) have both been implicated in recognition memory, but the nature of HPC–mPFC interactions, and its impact on local circuits in mediating this process is not known. Here we show that novelty discrimination is accompanied with higher theta activity (4–10 Hz) and increased c-Fos expression in both these regions. Moreover, theta oscillations were highly coupled between the HPC and mPFC during recognition memory retrieval for novelty discrimination, with the HPC leading the mPFC, but not during initial learning. Principal neurons and interneurons in the mPFC responded more strongly during recognition memory retrieval compared with learning. Optogenetic silencing of HPC input to the mPFC disrupted coupled theta activity between these two structures, as well as the animals' (male Sprague Dawley rats) ability to differentiate novel from familiar objects. These results reveal a key role of monosynaptic connections between the HPC and mPFC in novelty discrimination via theta coupling and identify neural populations that underlie this recognition memory-guided behavior. SIGNIFICANCE STATEMENT Many memory processes are highly dependent on the interregional communication between the HPC and mPFC via neural oscillations. However, how these two brain regions coordinate their oscillatory activity to engage local neural populations to mediate recognition memory for novelty discrimination is poorly understood. This study revealed that the HPC and mPFC theta oscillations and their temporal coupling is correlated with recognition memory-guided behavior. During novel object recognition, the HPC drives mPFC interneurons to effectively reduce the activity of principal neurons. This study provides the first evidence for the requirement of the HPC–mPFC pathway to mediate recognition memory for novelty discrimination and describes a mechanism for how this memory is regulated.
Publisher: Springer Science and Business Media LLC
Date: 28-04-2022
DOI: 10.1038/S41467-022-29997-9
Abstract: One of the greatest obstacles to the real application of solid-state refrigeration is the huge driving fields. Here, we report a giant barocaloric effect in inorganic NH 4 I with reversible entropy changes of $$\Delta {S}_{{P}_{0}\to P}^{{{\max }}}$$ Δ S P 0 → P max ∼71 J K −1 kg −1 around room temperature, associated with a structural phase transition. The phase transition temperature, T t , varies dramatically with pressure at a rate of d T t /d P ∼0.79 K MPa −1 , which leads to a very small saturation driving pressure of Δ P ∼40 MPa, an extremely large barocaloric strength of $$\left|\Delta {S}_{{P}_{0}\to P}^{{{\max }}}/\Delta P\right|$$ Δ S P 0 → P max / Δ P ∼1.78 J K −1 kg −1 MPa −1 , as well as a broad temperature span of ∼41 K under 80 MPa. Comprehensive characterizations of the crystal structures and atomic dynamics by neutron scattering reveal that a strong reorientation-vibration coupling is responsible for the large pressure sensitivity of T t . This work is expected to advance the practical application of barocaloric refrigeration.
Publisher: Elsevier BV
Date: 2023
Publisher: American Chemical Society (ACS)
Date: 17-02-2020
Publisher: Elsevier BV
Date: 07-2012
Publisher: Wiley
Date: 26-03-2014
Publisher: Springer Science and Business Media LLC
Date: 21-09-2021
DOI: 10.1038/S41467-021-25567-7
Abstract: Spin-orbit coupled honeycomb magnets with the Kitaev interaction have received a lot of attention due to their potential of hosting exotic quantum states including quantum spin liquids. Thus far, the most studied Kitaev systems are 4 d /5 d -based honeycomb magnets. Recent theoretical studies predicted that 3 d -based honeycomb magnets, including Na 2 Co 2 TeO 6 (NCTO), could also be a potential Kitaev system. Here, we have used a combination of heat capacity, magnetization, electron spin resonance measurements alongside inelastic neutron scattering (INS) to study NCTO’s quantum magnetism, and we have found a field-induced spin disordered state in an applied magnetic field range of 7.5 T B (⊥ b -axis) 10.5 T. The INS spectra were also simulated to tentatively extract the exchange interactions. As a 3 d -magnet with a field-induced disordered state on an effective spin-1/2 honeycomb lattice, NCTO expands the Kitaev model to 3 d compounds, promoting further interests on the spin-orbital effect in quantum magnets.
Publisher: Springer Science and Business Media LLC
Date: 02-12-2014
Publisher: American Association for the Advancement of Science (AAAS)
Date: 17-02-2023
Abstract: To harvest and reuse low-temperature waste heat, we propose and realize an emergent concept—barocaloric thermal batteries based on the large inverse barocaloric effect of ammonium thiocyanate (NH 4 SCN). Thermal charging is initialized upon pressurization through an order-to-disorder phase transition, and the discharging of 43 J g −1 takes place at depressurization, which is 11 times more than the input mechanical energy. The thermodynamic equilibrium nature of the pressure-restrained heat-carrying phase guarantees stable long-duration storage. The barocaloric thermal batteries reinforced by their solid microscopic mechanism are expected to substantially advance the ability to take advantage of waste heat.
Publisher: AIP Publishing
Date: 04-05-2015
DOI: 10.1063/1.4919895
Abstract: Structural and magnetic properties in TbMn2Si2 are studied by variable temperature X-ray diffraction, magnetization, electrical resistivity, and heat capacity measurements. TbMn2Si2 undergoes two successive magnetic transitions at around Tc1 = 50 K and Tc2 = 64 K. Tc1 remains almost constant with increasing magnetic field, but Tc2 shifts significantly to higher temperature. Thus, there are two partially overlapping peaks in the temperature dependence of magnetic entropy change, i.e., −ΔSM (T). The different responses of Tc1 and Tc2 to external magnetic field, and the overlapping of −ΔSM (T) around Tc1 and Tc2 induce a large refrigerant capacity (RC) within a large temperature range. The large reversible magnetocaloric effect (−ΔSMpeak ∼ 16 J/kg K for a field change of 0–5 T) and RC (=396 J/kg) indicate that TbMn2Si2 could be a promising candidate for low temperature magnetic refrigeration.
Publisher: Springer Science and Business Media LLC
Date: 18-10-2022
DOI: 10.1038/S41467-022-33927-0
Abstract: The limited capacity of the positive electrode active material in non-aqueous rechargeable lithium-based batteries acts as a stumbling block for developing high-energy storage devices. Although lithium transition metal oxides are high-capacity electrochemical active materials, the structural instability at high cell voltages (e.g., .3 V) detrimentally affects the battery performance. Here, to circumvent this issue, we propose a Li 1.46 Ni 0.32 Mn 1.2 O 4- x (0 x 4) material capable of forming a medium-entropy state spinel phase with partial cation disordering after initial delithiation. Via physicochemical measurements and theoretical calculations, we demonstrate the structural disorder in delithiated Li 1.46 Ni 0.32 Mn 1.2 O 4- x , the direct shuttling of Li ions from octahedral sites to the spinel structure and the charge-compensation Mn 3+ /Mn 4+ cationic redox mechanism after the initial delithiation. When tested in a coin cell configuration in combination with a Li metal anode and a LiPF 6 -based non-aqueous electrolyte, the Li 1.46 Ni 0.32 Mn 1.2 O 4- x -based positive electrode enables a discharge capacity of 314.1 mA h g −1 at 100 mA g −1 with an average cell discharge voltage of about 3.2 V at 25 ± 5 °C, which results in a calculated initial specific energy of 999.3 Wh kg −1 (based on mass of positive electrode’s active material).
Location: China
Start Date: 2019
End Date: 2021
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 2021
Funder: Rebecca L. Cooper Medical Research Foundation
View Funded ActivityStart Date: 2017
End Date: 2018
Funder: Parkinson's NSW
View Funded ActivityStart Date: 2021
End Date: 12-2023
Amount: $381,238.00
Funder: Australian Research Council
View Funded Activity