ORCID Profile
0000-0003-2524-8224
Current Organisations
Indian Institute of Technology Bombay
,
University of Calicut
,
Cochin University of Science and Technology
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: American Physical Society (APS)
Date: 24-02-2010
Publisher: IOP Publishing
Date: 21-12-2009
DOI: 10.1088/0953-8984/22/3/035601
Abstract: We report preparation, x-ray diffraction, magnetic susceptibility χ(T) and heat capacity C(p)(T) measurements on undoped s les as well as s les with Zn-doped (S = 0) at the Cu site BiCu(2(1-x))Zn(2x)PO(6), Ni-doped (S = 1) at the Cu site BiCu(2(1-y))Ni(2y)PO(6), and Ca doped (holes) at the Bi site Bi(1-z)Ca(z)Cu(2)PO(6) in the coupled two-leg spin ladder system BiCu(2)PO(6). While, Zn shows complete solid solubility, Ni could be doped to about 20% and Ca to about 15%. Magnetization and heat capacity data in the undoped compound point towards the existence of frustration effects. In all the s les, the χ(T) at low temperature increases with doping content. The Zn-induced susceptibility is smaller than that due to effective S = 1/2 moments, possibly due to frustrating next-nearest-neighbor interactions along the leg. For Zn content x>0.01, χ(T) deviates from the Curie law at low temperatures. The magnetic specific heat data C(m)(T) for the Zn-doped s les show weak anomalies at low temperature, in agreement with the χ(T) behavior. The anomalies are suggestive of spin freezing at low- T. In contrast, prominent effects are observed in χ(T) and C(m)(T) on Ni-doped s les. The zero-field-cooled (ZFC) and field-cooled (FC) χ(T) data are different from each other at low temperature, unlike that for Zn-doped s les, clearly indicating a transition to a spin-glass-like phase. No anomalies were found in Ca- or Pb-doped s les.
Publisher: Elsevier BV
Date: 2020
Publisher: Springer Science and Business Media LLC
Date: 22-03-2017
Publisher: IOP Publishing
Date: 26-10-2019
Publisher: Elsevier BV
Date: 08-2020
Publisher: American Physical Society (APS)
Date: 06-0088
Publisher: Springer Science and Business Media LLC
Date: 2017
Publisher: Elsevier BV
Date: 2020
Publisher: American Physical Society (APS)
Date: 24-08-2007
Publisher: American Physical Society (APS)
Date: 21-07-2009
Publisher: Elsevier BV
Date: 06-2019
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984174
Publisher: Elsevier BV
Date: 2021
Publisher: AIP Publishing
Date: 2020
DOI: 10.1063/5.0029866
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4980291
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5130273
Publisher: Springer Science and Business Media LLC
Date: 04-2010
Publisher: American Physical Society (APS)
Date: 12-08-2009
Publisher: Springer Science and Business Media LLC
Date: 02-2018
DOI: 10.1007/S13204-018-0655-6
Abstract: The overall effectiveness of a photocatalytic water treatment method strongly depends on various physicochemical factors. Superparamagnetic photocatalysts have incomparable advantage of easy separation using external magnetic fields. So, the synthesis of efficient superparamagnetic photocatalysts and the development of a deep understanding of the factors influencing their catalytic performances are important. Co x Zn 1− x Fe 2 O 4 ( x = 0, 0.5, 1) ferrite nanospheres were synthesized by the solvothermal route. The reduction of Cr(VI) and degradation of methyl orange (MO) impurities were carried out in single- and binary-component system under visible light irradiation. The adsorption experiments were done by the catalyst in the water solution containing the impurities. The magnetic and optical properties were studied by VSM and UV–Vis analysis. The nature of porosity was investigated using the BET method. 3D nanospheres of diameter about 5–10 nm were fabricated. The binary-contaminant system exhibited synergetic photocatalytic effect (80% improvement in activity rate) against the nanoparticles. The corresponding mechanism is discussed. CoFe 2 O 4 exhibited better adsorption, photocatalytic and magnetic separation efficiency due to its higher surface area (50% higher), narrower band gap (25% lesser), smaller crystallite size, a strong magnetic strength (51.35 emu/g) and meso–macro hierarchical porous structure. The adsorption of Cr(VI) and MO can be approximated to the Langmuir and Freundlich model, respectively.
No related grants have been discovered for Libu K Alexander.