高压相变与时间的关系

洪时明

doi:10.11858/gywlxb.2013.02.002

高压相变与时间的关系

doi: 10.11858/gywlxb.2013.02.002

洪时明^,

西南交通大学高温高压物理研究所，四川成都 610031

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洪时明 E-mail:smhong2@163.com

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出版历程
- 收稿日期: 2013-03-18
- 修回日期: 2013-03-18
- 发布日期: 2013-04-15

Time Dependence of High Pressure Induced Phase Transitions

HONG Shi-Ming^,

Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 为了研究压致相变的动力学行为，最期待的途径是将高时间分辨率的检测手段与精确的压缩技术相结合。实际上，在大压机上可采用间接的方法，即将回收样品的表征结果与样品所经历的压力、温度和时间进行对比。作为典型例子，根据过去的实验数据，讨论了C-H-O体系中金刚石的成核条件与时间的关系，证明延长保温保压时间有利于高压稳定相的形成。与此相反，一些亚稳相，如大块非晶硫、金属玻璃和非晶高分子材料等，则可通过快速压缩过程获得。实验结果表明：许多物质的相变动力学特征可以在1~103 GPa/s量级的压缩速率中表现出来。在两类实验中，都可以建立包括压力、温度和时间3个维度的动力学相图。
- 高压相变 /
- 时间相关性 /
- 相变动力学
Abstract: For investigating kinetic behavior of pressure induced phase transitions, it is the most expected to combine high time-resolved diagnostic probes with the precise compression techniques. In fact, an indirect way in large volume press is compare characterization results of recovered samples with their experienced conditions including pressure, temperature and time. As a typical example, relationship between p-T conditions and time for diamond nucleation in C-H-O system is discussed by previous experimental data, demonstrated that extending loading time under HP/HT is propitious to form high pressure stable phase. In contrast, some meta-stable phases, such as bulk amorphous sulfur, metallic glasses and amorphous polymers etc., were obtained by rapid compression process. The results indicated that many substances can show the kinetic features of phase transition in the scale of compression rate from 1 GPa to 1 TPa/s. The kinetic phase diagrams with three dimensions (pressure, temperature and time) could be established through both of the static or rapid compression experiments.
- pressure induced phase transition /
- time dependence /
- kinetics of phase transition

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参考文献(39)

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