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Phase transition and abnormal compressibility of lanthanide silicate with the apatite structure

机译:具有磷灰石结构的镧系硅酸盐的相变和异常压缩性

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摘要

The lanthanide silicate La_(9.33)Si_6O_(26), which has the hexagonal apatite structure (P6_3/m), was investigated at high pressure. A subtle phase transition was observed at ~13.3 GPa by in situ synchrotron x-ray diffraction and confirmed by infrared absorption and Raman scattering measurements. The high-pressure phase has a structure similar to that of the initial hexagonal apatite structure, but the symmetry is reduced to P6_3 through the displacement of one oxygen site and tilting of the SiO_4 tetrahedra. Interestingly, the high-pressure phase has an abnormally lower compressibility, which is caused by the change in symmetry that allows the tilting of the SiO_4 tetrahedra, and the bulk modulus of the high-pressure phase is only half that of the apatite structure.
机译:在高压下研究了具有六方磷灰石结构(P6_3 / m)的镧系硅酸盐La_(9.33)Si_6O_(26)。原位同步加速器X射线衍射在〜13.3 GPa处观察到微妙的相变,并通过红外吸收和拉曼散射测量得到证实。高压相具有与初始六角形磷灰石结构相似的结构,但是通过一个氧位的位移和SiO_4四面体的倾斜,对称性降低到P6_3。有趣的是,高压相具有异常低的可压缩性,这是由允许SiO_4四面体倾斜的对称性变化引起的,并且高压相的体积模量仅为磷灰石结构的一半。

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  • 来源
    《Physical review》 |2012年第21期|p.214116.1-214116.6|共6页
  • 作者单位

    Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109;

    Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109;

    Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109;

    Department of Geosciences, SUNY, Stony Brook, New York 11794;

    Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015;

    Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180;

    Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pressure treatment;

    机译:压力治疗;

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