Structural, spectroscopic, magnetic and electrical characterization of Ca-doped polycrystalline bismuth ferrite, Bi1−xCaxFeO3−x/2(x≤ 0.1)
Sardar, Kripasindhu, Hong, Jiawang, Catalan, Gustau, Biswas, P. K. (Pabitra K.), Lees, Martin R., Walton, Richard I., 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, Vol.24 (No.4). 045905. ISSN 0953-8984Full text not available from this repository.
Official URL: http://dx.doi.org/10.1088/0953-8984/24/4/045905
The crystal structure and physical properties of multiferroic polycrystalline Ca(2+)-doped BiFeO(3) samples have been investigated. The present experimental investigation suggests that Bi(1-x)Ca(x)FeO(3-x/2) (x <= 0: 1) can be considered as a solid solution between BiFeO(3) and CaFeO(2.5). 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 BiFeO(3). All compositions studied show antiferromagnetic behaviour along with a ferromagnetic component that increases with Ca(2+) doping. The resistivities of the Bi(1-x)Ca(x)FeO(3-x/2) samples at room temperature are of the order of 10(9) Omega cm and decrease with increasing Ca(2+) 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:||Journal Article|
|Subjects:||Q Science > QC Physics
Q Science > QD Chemistry
|Divisions:||Faculty of Science > Chemistry
Faculty of Science > Physics
|Journal or Publication Title:||Journal of Physics: Condensed Matter|
|Publisher:||Institute of Physics Publishing Ltd.|
|Date:||1 February 2012|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Advantage West Midlands (AWM)|
|Grant number:||European Regional Development Fund (ERDF)|
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