Phase transitions in bismuth under rapid compression
Phase transitions in bismuth under rapid compression
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DOI：
10.1088/1674-1056/28/3/036201
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发表时间：
2019-03-01
影响因子：
1.7
通讯作者：
Li, Xiao-Dong
中科院分区：
文献类型：
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作者：
Yang, Dong-Liang;Liu, Jing;Li, Xiao-Dong
在动态金刚石对顶砧装置上，用时间分辨同步辐射X射线衍射研究了铋在快速压缩下的结构相变。在300 K下，随着压力的增加，在不同的压缩率下，观察到了从相I到相II，到相III，再到相V的转变。与静态压缩结果相比，在0.20 ~ 183.8GPa/s的压缩速率范围内，快速压缩没有出现新的相变序列。然而，在从相III过渡到相V的过程中，产物相的体积分数作为压力的函数可以很好地拟合由压缩率依赖的S形曲线。由此得到的参数表明，与此相变相关的活化能，以及起始转变压力，显示出压缩率依赖的性能。在快速压缩下，超压对压缩率有很强的依赖性。提出了超压计算公式，可用于定量计算超压。
The structural phase transitions of bismuth under rapid compression has been investigated in a dynamic diamond anvil cell using time-resolved synchrotron x-ray diffraction. As the pressure increases, the transformations from phase I, to phase II, to phase III, and then to phase V have been observed under different compression rates at 300 K. Compared with static compression results, no new phase transition sequence appears under rapid compression at compression rate from 0.20 GPa/s to 183.8 GPa/s. However, during the process across the transition from phase III to phase V, the volume fraction of product phase as a function of pressure can be well fitted by a compression-rate-dependent sigmoidal curve. The resulting parameters indicate that the activation energy related to this phase transition, as well as the onset transition pressure, shows a compression-rate-dependent performance. A strong dependence of over-pressurization on compression rate occurs under rapid compression. A formula for over-pressure has been proposed, which can be used to quantify the over-pressurization.