Crystal structural variation and phase transition in caesium trichlorocuprate at high pressure
作者:A G Christy、R J Angel、J Haines、S M Clark
DOI:10.1088/0953-8984/6/17/005
日期:1994.4.25
CsCuCl3 undergoes a phasetransition at pressures between 1.65 and 3.1 GPa. The transitionpressure is strongly dependent upon the form of the sample, being lower in powder specimens than in single crystals. The transition is first order in character and is accompanied by a 1.8% volume charge and a reduction in the length of the c-axis from the six-layer repeat of the room pressurephase to a two-layer
单晶和粉末 X 射线衍射实验以及拉曼光谱表明,“六方钙钛矿”CsCuCl3 在 1.65 到 3.1 GPa 的压力下发生相变。转变压力很大程度上取决于样品的形式,粉末样品中的转变压力低于单晶中的转变压力。这种转变是一级性质的,伴随着 1.8% 的体积电荷和 c 轴长度从室温相的六层重复到两层重复的减少。这些观察结果,连同转变时拉曼模式的变化,使我们得出结论,高压结构包含静态无序的 Jahn-Teller 扭曲的 CuCl6 八面体,与已知的高温相相反,后者包含动态无序的扭曲八面体,
Popov, A. I.; Kiselev, Yu. M., Russian Journal of Inorganic Chemistry, 1988, vol. 33, p. 1309 - 1312