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High-pressure phases of a hydrogen-rich compound: Tetramethylgermane

机译：富氢化合物的高压相：四甲基锗烷

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摘要

The vibrational and structural properties of a hydrogen-rich group IVa hydride, Ge(CH_3)_4, are studied by combining Raman spectroscopy and synchrotron x-ray diffraction measurements at room temperature and at pressures up to 30.2 GPa. Both techniques allow the obtaining of complementary information on the high-pressure behaviors and yield consistent phase transitions at 1.4 GPa for the liquid to solid and 3.0, 5.4, and 20.3 GPa for the solid to solid. The four high-pressure solid phases are identified to have the cubic, orthorhombic, monoclinic, and monoclinic crystal structures with space groups of Pa-3 for phase I, Pnma for phase II, P2_1/c for phase III, and P2 for phase IV, respectively. These transitions are suggested to result from the changes in the inter-and intramolecular bonding of this compound. The softening of some Raman modes on CH_3 groups and their sudden disappearance indicate that Ge(CH_3)_4 might be an ideal compound to realize metallization and even high-temperature superconductivity at modest static pressure for laboratory capability.
机译：通过在室温和最高30.2 GPa的压力下结合拉曼光谱和同步加速器X射线衍射测量研究了富氢的IVa氢化物Ge（CH_3）_4的振动和结构性质。两种技术都允许获得有关高压行为的补充信息，并在液体到固体的情况下在1.4 GPa时产生稳定的相变，在固体到固体的情况下产生3.0、5.4和20.3 GPa的一致相变。鉴定出四个高压固相具有立方，正交，单斜和单斜晶体结构，其中相I的Pa-3，相II的Pnma，相III的P2_1 / c和相IV的P2具有空间群， 分别。这些转变被认为是由于该化合物的分子间和分子内键合的变化引起的。 CH_3基团上某些拉曼模式的软化及其突然消失表明，Ge（CH_3）_4可能是在实验室条件下在适度静压下实现金属化甚至高温超导的理想化合物。

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  • 来源
    《Physical review》 |2012年第18期|184110.1-184110.9|共9页
  • 作者

    Zhen-Xing Qin; Chao Zhang; Ling-Yun Tang; Guo-Hua Zhong; Hai-Qing Lin; Xiao-Jia Chen;

  • 作者单位

    Department of Physics, South China University of Technology, Guangzhou 510640, China;

    Beijing Computational Science Research Center, Beijing 100084, China;

    Department of Physics, South China University of Technology, Guangzhou 510640, China;

    Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;

    Beijing Computational Science Research Center, Beijing 100084, China,Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;

    Department of Physics, South China University of Technology, Guangzhou 510640, China,Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA,Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China;

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  • 正文语种 eng
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  • 关键词

    disordered solids;

    机译：无序固体;

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