微晶
材料科学
成核
无定形固体
高压
结晶学
拉曼光谱
化学物理
不稳定性
分子动力学
活化能
热力学
亚稳态
化学
物理化学
计算化学
光学
物理
有机化学
机械
冶金
作者
T. Yamanaka,Tatsuzo Nagai,Taku Tsuchiya
出处
期刊:Zeitschrift für Kristallographie
[De Gruyter]
日期:1997-06-01
卷期号:212 (6): 401-410
被引量:45
标识
DOI:10.1524/zkri.1997.212.6.401
摘要
Abstract Several crystalline substances have been found to be transformed into the amorphous state under compressed condition at kinetically low temperature. Dynamical lattice-instability due to elastic deformation by shear and stress induces the reversible amorphization, some of which produces memory glass. On the other hand the irreversible modes are attributed to the plastic deformation by the nucleation of high-pressure form in the parent lattice but thermal energy is not kinetically high enough to provide the large crystallite size coherent to the X-ray radiation. They can be defined as X-ray amorphous. These reversible and irreversible transformations arise from the hindrance to sufficient atomic mobility. These pressure-induced amorphizations are the precursor phenomena of the phase transformation to high-pressure polymorphs. Successive structure changes of the pressure-induced amorphization are investigated under various pressure and temperature by X-ray diffractometry, EXAFS and Raman spectroscopy. The amorphization has been also simulated by the molecular dynamics.
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