Structural, spectroscopic, magnetic and electrical characterization of Ca-doped polycrystalline bismuth ferrite, Bi1−xCaxFeO3−x/2 (x ≤ 0.1)

Sardar, Kripasindhu and Hong, Jiawang and Catalan, Gustau and Biswas, P. K. and Lees, Martin R. and Walton, Richard I. and Scott, James F. and Redfern, Simon A. T. (2012) Structural, spectroscopic, magnetic and electrical characterization of Ca-doped polycrystalline bismuth ferrite, Bi1−xCaxFeO3−x/2 (x ≤ 0.1). Journal of Physics: Condensed Matter, 24 (4). 045905. ISSN 0953-8984, ESSN: 1361-648X DOI 10.1088/0953-8984/24/4/045905

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Official URL: http://iopscience.iop.org/0953-8984/24/4/045905

Abstract

The crystal structure and physical properties of multiferroic polycrystalline Ca2+-doped BiFeO3 samples have been investigated. The present experimental investigation suggests that Bi1−xCaxFeO3−x/2 (x ≤ 0.1) can be considered as a solid solution between BiFeO3 and CaFeO2.5. The oxidation state of Fe in these materials is + 3 and charge balance occurs through the creation of oxygen vacancies. For each composition, two structural phase transitions are revealed as anomalies in the variable-temperature in situ x-ray diffraction data which is consistent with the well-established high-temperature structural transformation in pure BiFeO3. All compositions studied show antiferromagnetic behaviour along with a ferromagnetic component that increases with Ca2+ doping. The resistivities of the Bi1−xCaxFeO3−x/2 samples at room temperature are of the order of 109 Ω cm and decrease with increasing Ca2+ content. Arrhenius plots of the resistivity show two distinct linear regions with activation energies in the range of 0.4–0.7 and 0.03–0.16 eV. A correlation has been established between the critical temperatures associated with the structural phase transitions and the multiferroic properties. A composition of x = 0.085 is predicted to show maximum magneto-electric coupling.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA65;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 24
Page Range: 045905
Identification Number: 10.1088/0953-8984/24/4/045905
Depositing User: Sarah Humbert
Date Deposited: 09 Mar 2013 12:45
Last Modified: 23 Jul 2013 10:05
URI: http://eprints.esc.cam.ac.uk/id/eprint/2689

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