Institute for Shock Physics and Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2816, USA.
J Phys Chem A. 2013 Jun 27;117(25):5306-13. doi: 10.1021/jp404283a. Epub 2013 Jun 13.
To elucidate the behavior of PETN at thermo-mechanical conditions relevant for shock initiation, Raman spectroscopy, and optical imaging were used to examine its static high pressure and high temperature (HP-HT) response. Experiments were performed on single crystals in a heated diamond anvil cell at pressures to 14 GPa and temperatures ranging from room temperatures to 550 K. Regarding the pressure-induced PETN-I transition to PETN-III at room temperature, our results show that nonhydrostaticity plays an important role in driving this transition. Furthermore, we found that PETN-III transforms to PETN-IV at high temperatures, and this transformation can involve lowering of molecular symmetry from C2 to C1. The HP-HT phase diagram for PETN presented here includes the melting/decomposition curve and boundaries between three PETN phases: PETN-I, PETN-III, and PETN-IV. The relevance of static compression results for shock initiation of PETN is discussed.
为了阐明 PETN 在与冲击波引发相关的热机械条件下的行为，我们采用拉曼光谱和光学成像技术来研究其静态高压高温（HP-HT）响应。实验在加热的金刚石压腔中的单晶上进行，压力高达 14 GPa，温度范围从室温到 550 K。关于室温下 PETN-I 向 PETN-III 的压力诱导转变，我们的结果表明，非静水压力在驱动这一转变中起着重要作用。此外，我们发现 PETN-III 在高温下会转化为 PETN-IV，并且这种转变可能涉及分子对称性从 C2 降低到 C1。这里呈现的 PETN 的 HP-HT 相图包括熔化/分解曲线以及 PETN 的三个相之间的边界：PETN-I、PETN-III 和 PETN-IV。讨论了静态压缩结果对 PETN 冲击波引发的相关性。
