多铁性钙钛矿BiFeO3压致相变的远红外显微光谱研究
Pressure-induced phase transitions in the multiferroic perovskite BiFeO3 studied by far-infrared micro-spectroscopy
摘要：
我们提出了在室温下的多铁性钙钛矿BiFeO3的压力依赖的远红外反射率测量的结果。所观察到的红外活性声子模的行为作为压力的函数，清楚地揭示了两个结构相变约3.0和7.5 GPa，支持最近的拉曼和X射线衍射研究的结果在压力下。基于红外激活声子模随压力的频移，我们讨论了相变的可能特征。
英文摘要：
We present the results of pressure-dependent far-infrared reflectivity measurements on the multiferroic perovskite BiFeO3 at room temperature. The observed behavior of the infrared-active phonon modes as a funtion of pressure clearly reveals two structural phase transitions around 3.0 and 7.5 GPa, supporting the results of recent Raman and x-ray diffraction studies under pressure. Based on the pressure-dependent frequency shifts of the infrared-active phonon modes we discuss the possible character of the phase transitions.
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