Pressure-induced sharp coordination change in liquid germanate
Pressure-induced sharp coordination change in liquid germanate
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DOI：
10.1103/physrevlett.92.155506
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发表时间：
2004-04-16
影响因子：
8.6
通讯作者：
Yoshiasa, A
中科院分区：
文献类型：
--
作者：
Ohtaka, O;Arima, H;Yoshiasa, A
用原位X射线吸收测量方法研究了液态锗酸盐中锗周围的局域结构。由四面体配位的锗组成的液体锗酸盐随着压力的增加而收缩，直到2.5 GPa，局部结构没有显着变化，然后在3 GPa附近显示出突然的四倍至六倍的配位变化。配位变化在4GPa以下完成，其中由八面体配位的锗组成的高密度液体变得稳定。GeO_6八面体在高密度液体中比固体中更易压缩。
Local structures around germanium in liquid germanate have been investigated by means of in situ x-ray absorption measurements up to 9 GPa at 1273 K. Liquid germanate consisting of tetrahedrally coordinated germanium contracts with increasing pressure without significant changes in the local structure up to 2.5 GPa and then shows an abrupt fourfold-to-sixfold coordination change around 3 GPa. The coordination change is completed below 4 GPa where upon a high-density liquid consisting of octahedrally coordinated germanium becomes stable. The GeO6 octahedron in the high-density liquid is more compressible than that in solids.