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arXiv 0811.0047cond-mat.mtrl-sci
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高压对多铁性BiFeO3的影响

Effect of high pressure on multiferroic BiFeO3

R. Haumont, P. Bouvier, A. Pashkin, K. Rabia, S. Frank, B. Dkhil, W. A. Crichton, C. A. Kuntscher, J. Kreisel

摘要:

我们报告的压力不稳定性的模型多铁性BiFeO 3的实验证据,即揭示了两个结构相变约3 GPa和10 GPa的衍射和远红外光谱在同步辐射源。从3到9 GPa的中间相在单斜空间群中结晶,具有八面体倾斜和小的阳离子位移。当压力进一步增加时,BiFeO3的阳离子位移(以及因此极性特征)被抑制在10 GPa以上。上述10 GPa下观察到的非极性正交Pnma结构与最近的理论从头算预测一致,而中间单斜相没有理论预测。

英文摘要:

We report experimental evidence for pressure instabilities in the model multiferroic BiFeO3 and namely reveal two structural phase transitions around 3 GPa and 10 GPa by using diffraction and far-infrared spectroscopy at a synchrotron source. The intermediate phase from 3 to 9 GPa crystallizes in a monoclinic space group, with octahedra tilts and small cation displacements. When the pressure is further increased the cation displacements (and thus the polar character) of BiFeO3 is suppressed above 10 GPa. The above 10 GPa observed non-polar orthorhombic Pnma structure is in agreement with recent theoretical ab-initio prediction, while the intermediate monoclinic phase was not predicted theoretically.

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