锗在高压下固化时的相演化及动力学成因

PHASE EVOLUTION OF GERMANIUM DURING SOLIDIFICATION AT HIGH PRESSURE

报道了锗在高压下固化时亚稳相的形成和转化。通过原位观测锗在高压下固化过程中的电阻变化、差热信号，并结合Ｘ射线衍射分析，详细讨论了锗在高压下固化时的相演化行为。在我们所进行的实验条件下，当压力大于４ＧＰａ时，熔态锗首先固化成金属锗，然后再向ＧｅⅠ或ＧｅⅢ相转变。还讨论了压力对锗的固化动力学参数的影响。

In this paper the phase evolution in the solidification process of germanium under high pressure is investigated.Data obtained on electrical resistance changes,and in situ differential thermal measurements,as well as X ray diffraction results enable us to arrive at the phase relations and transformation processes occurred during solidification at high pressure.Under high pressure above 4GPa,the metallic germanium phase is first solidified from the melt and then transformed into Ge Ⅰ phase and/or GeⅢ phase.The kinetics of the nonequilibrium transitions is also briefly discussed.