Investigation of structural,magnetic and optical properties of rare earth substituted bismuth ferrite
来源期刊：Journal of Rare Earths2013年第4期
论文作者：T.Durga Rao T.Karthik Saket Asthana
文章页码：370 - 375
摘 要：Polycrystalline BiFeO3 and rare earth substituted Bi0.9R0.1FeO3（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（A 1） 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 6A1g → 4T2g energy transition band.BRFO compounds with improved remnant magnetization and coercive field are applicable for magnetoelectric devices.
T.Durga Rao1，T.Karthik1,2，Saket Asthana1
1. Advanced Functional Materials Laboratory,Department of Physics,Indian Institute of Technology Hyderabad2. Department of Materials Science and Engineering,Indian Institute of Technology Hyderabad
摘 要：Polycrystalline BiFeO3 and rare earth substituted Bi0.9R0.1FeO3（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（A 1） 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 6A1g → 4T2g energy transition band.BRFO compounds with improved remnant magnetization and coercive field are applicable for magnetoelectric devices.
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