Structural, dielectric and multiferroic properties of Er and La substituted BiFeO3 ceramics
作者： Pragya Pandit , S. Satapathy , Poorva Sharma , P. K. Gupta , S. M. Yusuf
DOI: 10.1007/S12034-011-0212-3
关键词:
摘要: Erbium (Er) and lanthanum (La) substituted BiFeO3 (BFO) ceramics have been prepared through conventional solid solution route. X-ray diffraction data indicated a gradual phase transition from rhombohedral to monoclinic structure in Bi0·9−x La0·1Erx FeO3 (x = 0·05, 0·07 0·1) (BLEFOx 0·07, ceramics. Differential thermal analysis (DTA) measurements of BFO samples showed ferroelectric at 835°C, whereas it is shifted 792°C for BLEFOx 0·1. The Raman spectra 0·1 the shift modes higher wavenumbers suppression A1 indicating decrease ferroelectricity. also structural transformation due Er La substitution BFO. On subsequent erbium doping, intrinsic dielectric constant found 68 (for pure BFO) 52 0·05 43 but increased 89 when compared increase content resulted spontaneous magnetization (0·1178 emu/g 8T collapse spin cycloid structure. Ferroelectric remnant polarization decreases while small (close paraelectric behaviour) evident
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