arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1005.0262cond-mat.mtrl-scicond-mat.other
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CuWO4的高压结构相变

High-pressure structural phase transitions in CuWO4

J. Ruiz-Fuertes, D. Errandonea, R. Lacomba-Perales, A. Segura, J. Gonzalez, F. Rodriguez, F. J. Manjon, S. Ray, P. Rodriguez-Hernandez, A. Munoz, Zh. Zhu, C. Y. Tu

摘要:

我们研究了压力对铜白钨矿的结构、振动和磁性行为的影响。我们进行了粉末X射线衍射和拉曼光谱实验高达27 GPa,以及从头算总能量和晶格动力学计算。实验提供的证据表明,结构相变发生在10 GPa的低压三斜相(P-1)的单斜钨型结构(P2/c)。计算证实了这一发现,并表明,相变涉及的磁序的变化。此外,还确定了三斜相的物态方程:V0 = 132.8(2)A3,B 0 = 139(6)GPa,= 4。在不同应力条件下的实验表明,非流体静力应力在17 GPa时引起第二次相变,降低了CuWO 4的压缩性,B 0 = 171(6)GPa。的三斜相和高压相的所有拉曼模式的压力依赖性也报道和讨论。

英文摘要:

We study the effects of pressure on the structural, vibrational, and magnetic behavior of cuproscheelite. We performed powder x-ray diffraction and Raman spectroscopy experiments up to 27 GPa as well as ab initio total-energy and lattice-dynamics calculations. Experiments provide evidence that a structural phase transition takes place at 10 GPa from the low-pressure triclinic phase (P-1) to a monoclinic wolframite-type structure (P2/c). Calculations confirmed this finding and indicate that the phase transformation involves a change in the magnetic order. In addition, the equation of state for the triclinic phase is determined: V0 = 132.8(2) A3, B0 = 139 (6) GPa and = 4. Furthermore, experiments under different stress conditions show that non-hydrostatic stresses induce a second phase transition at 17 GPa and reduce the compressibility of CuWO4, B0 = 171(6) GPa. The pressure dependence of all Raman modes of the triclinic and high-pressure phases is also reported and discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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