Pressure effect on structural and vibrational properties of Y-substituted BiFeO3

• Published in: Journal of physics. Condensed matter 2013-09, Vol.25 (36), p.365401-365401
• Main Authors: Wu, Yu-Jie, Qin, Zhen-Xing, Chen, Xiao-Kun, Zhang, Jing, Liu, Jing, Wu, Zhigang, Chen, Xiao-Jia
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Ferroelectricity and antiferroelectricity; Lattice dynamics; Phonon states and bands, normal modes, and phonon dispersion; Phonons and vibrations in crystal lattices; Physics; Solid-solid transitions; Specific phase transitions
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/25/36/365401

The structural and vibrational properties of 5% Y-substituted BiFeO3 under pressure have been investigated using synchrotron x-ray diffraction (SXRD) and Raman scattering measurements. At a pressure below 30.3 GPa, distinct changes in the Raman spectra and SRXD pattern show evidence for one pressure-induced structural transition from the polar rhombohedral R3c phase to the nonpolar orthorhombic Pnma phase commencing at 3.6 and completed at 7.2 GPa, where there is a region of phase coexistence between the R3c and Pnma phases. At a higher pressure of 40.8 GPa, another phase transition from orthorhombic to cubic is observed accompanied by the insulator-metal transition. Our data do not suggest the pressure-induced re-entrance of ferroelectricity in the model multiferroic Bi0.95Fe0.05O3 in the pressure range studied.