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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Anomalous high-pressure behavior of amorphous selenium from synchrotron x-ray diffraction and microtomography
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Anomalous high-pressure behavior of amorphous selenium from synchrotron x-ray diffraction and microtomography

机译：同步加速器X射线衍射和显微断层照相法检测非晶态硒的异常高压行为

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摘要

The high-pressure behavior of amorphous selenium has been investigated with time-resolved diamond anvil cell synchrotron x-ray diffraction and computed microtomography techniques. A two-step dynamic crystallization process is observed in which the monoclinic phase crystallized from the amorphous selenium and gradually converted to the trigonal phase, thereby explaining previously observed anomalous changes in electrical conductivity of the material under pressure. The crystallization of this elemental system involves local topological fluctuations and results in an unusual pressure-induced volume expansion. The metastability of the phases involved in the transition accounts for this phenomenon. The results demonstrate the use of pressure to control and directly monitor the relative densities and energetics of phases to create new phases from highly metastable states. The microtomo-graphic technique developed here represents a method for determination of the equations of state of amorphous materials at extreme pressures and temperatures.
机译：用时间分辨的金刚石砧室同步加速器X射线衍射和计算机断层摄影技术研究了非晶态硒的高压行为。观察到两步动态结晶过程，其中单斜晶相从非晶态硒结晶并逐渐转变为三角相，从而解释了先前观察到的材料在压力下的电导率异常变化。该元素系统的结晶涉及局部拓扑波动，并导致异常的压力诱导的体积膨胀。过渡所涉及的阶段的亚稳性解释了这种现象。结果表明使用压力来控制和直接监测相的相对密度和能级，以从高度亚稳态形成新的相。本文开发的显微照相技术代表了一种确定极端压力和温度下非晶态材料状态方程的方法。

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