Investigation of structural, magnetic and optical properties of rare earth substituted bismuth ferrite

Rao, T D and Karthik, T and Asthana, Saket (2013) Investigation of structural, magnetic and optical properties of rare earth substituted bismuth ferrite. Journal of Rare Earths, 31 (4). pp. 370-375. ISSN 1002-0721

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Polycrystalline BiFeO3 and rare earth substituted Bi 0.9R0.1FeO3 (BRFO, R=Y, Ho and Er) compounds were prepared by rapid solid state sintering technique. Structural phase analysis indicated that all the compounds stabilized in rhombohedral structure (R3c space group) and a small orthorhombic phase fraction was observed in BRFO compounds. From the Raman spectra results, the changes in the phonon frequencies (A1) and line widths suggested lattice distortion in the BRFO compounds as was evidenced in the XRD analysis. Compared to the linear variation of magnetization with magnetic field (M-H) shown by BFO, an obvious M-H loop was observed in BRFO compounds which could be due to the suppression of space modulated spin structure and was explained on the basis of weak ferromagnetism and field induced spin reorientation. UV-Vis spectroscopy evidenced a change in local FeO6 environment due to shift in the 6A 1g→4T2g energy transition band. BRFO compounds with improved remnant magnetization and coercive field are applicable for magnetoelectric devices.

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IITH Creators:
IITH CreatorsORCiD
Asthana, Saket
Item Type: Article
Uncontrolled Keywords: G-type antiferromagnet; rare earths; spin-reorientation; structural distortion
Subjects: Others > Earth sciences
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 28 Nov 2014 08:48
Last Modified: 29 Aug 2017 09:52
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