High-pressure phases of a hydrogen-rich compound: tetramethylgermane
High-pressure phases of a hydrogen-rich compound: tetramethylgermane
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DOI：
10.1103/physrevb.86.184110
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发表时间：
2012-10
影响因子：
3.7
通讯作者：
Zhen Qin;Chao Zhang;Ling-yun Tang;G. Zhong;Hai-Qing Lin;Xiao-Jia Chen
中科院分区：
文献类型：
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作者：
Zhen Qin;Chao Zhang;Ling-yun Tang;G. Zhong;Hai-Qing Lin;Xiao-Jia Chen
通过在室温和高达 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 IVa 族氢化物 Ge(CH3)4 的振动和结构特性。两种技术都可以获取有关高压行为的补充信息，并在 1.4 GPa（液体到固体）和 3.0、5.4 和 20.3 GPa（固体到固体）下产生一致的相变。四种高压固相被鉴定为具有立方、斜方、单斜和单斜晶体结构，I相空间群为Pa-3，II相空间群为Pnma，III相空间群为P21/c，IV相空间群为P21。这些转变被认为是由该化合物分子间和分子内键合的变化引起的。 CH3 基团上一些拉曼模式的软化及其突然消失表明，Ge(CH3)4 可能是一种理想的化合物，可以在实验室能力的适度静压下实现金属化甚至高温超导。
The vibrational and structural properties of a hydrogen-rich group IVa hydride, Ge(CH3)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 allowthe 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, P21/c for phase III, and P21 for phase IV, respectively. These transitions are suggested to result from the changes in the interand intramolecular bonding of this compound. The softening of some Raman modes on CH3 groups and their sudden disappearance indicate that Ge(CH3)4 might be an ideal compound to realize metallization and even high-temperature superconductivity at modest static pressure for laboratory capability.