Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China.
J Phys Condens Matter. 2013 Sep 11;25(36):365401. doi: 10.1088/0953-8984/25/36/365401. Epub 2013 Aug 8.
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.
采用同步辐射 X 射线衍射（SXRD）和拉曼散射测量研究了 5%Y 取代的 BiFeO3 在压力下的结构和振动特性。在低于 30.3 GPa 的压力下，拉曼光谱和 SXRD 图谱的明显变化表明存在从极性三方 R3c 相到非极性正交 Pnma 相的单一压力诱导结构相变，该相变起始于 3.6 GPa，在 7.2 GPa 时完成，在 R3c 和 Pnma 相之间存在一个相共存区域。在更高的 40.8 GPa 压力下，观察到从正交相到立方相的另一个相变，伴随着绝缘-金属转变。我们的数据表明，在所研究的压力范围内，模型多铁性 Bi0.95Fe0.05O3 中没有出现压致铁电性的重新出现。
