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arXiv 1105.2676cond-mat.mtrl-sci
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BiFeO3中的高压相变:流体静力学与非流体静力学条件

High-pressure phase transitions in BiFeO3: hydrostatic vs. non-hydrostatic conditions

Mael Guennou, Pierre Bouvier, Raphaël Haumont, Gaston Garbarino, Jens Kreisel

摘要:

我们报告的高压X射线衍射实验BiFeO3(BFO)单晶在金刚石压砧细胞高达14 GPa。两个数据集进行了比较,一个在流体静力学条件下,与氦气作为传压介质,另一个在非流体静力学条件下,与硅油作为传压介质。结果表明,在两种情况下,晶体经历不同的相变,突出了BFO的高敏感性的非静水应力。高压结构研究的解释的后果进行了讨论。

英文摘要:

We report high-pressure x-ray diffraction experiments on BiFeO3 (BFO) single crystals in diamond-anvil cells up to 14 GPa. Two data sets are compared, one in hydrostatic conditions, with helium used as pressure-transmitting medium, and the other in non-hydrostatic conditions, with silicon oil as pressure-transmitting medium. It is shown that the crystal undergoes different phase transitions in the two cases, highlighting the high sensitivity of BFO to non-hydrostatic stress. Consequences for the interpretation of high-pressure structural studies are discussed.

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