Lipinska-Kalita Kristina E, Pravica Michael G, Nicol Malcolm
High Pressure Science and Engineering Center, Department of Physics, University of Nevada Las Vegas, Las Vegas, Nevada 89154-4002, USA.
J Phys Chem B. 2005 Oct 20;109(41):19223-7. doi: 10.1021/jp052713f.
High-pressure Raman scattering studies have been performed on a crystalline energetic material, pentaerythritol tetranitrate C(CH2ONO2)4 (PETN), an important secondary explosive. In situ, ambient-temperature investigations employed diamond anvil cell techniques and nitrogen as a quasi-hydrostatic-pressure-transmitting medium. The pressure-induced alterations in the profiles of the Raman lines, including positions, bandwidths, and intensities, were studied in a compression sequence up to about 31.3 GPa and in a subsequent decompression to ambient conditions. The observed changes of the Raman spectra implied that PETN gradually densified and compressed smoothly up to the highest investigated pressures. Compression below 12 GPa gradually shifted all Raman peaks to higher frequencies without significantly changing their relative intensities or bandwidths. At higher pressures, the peak intensities of the Raman spectra decreased considerably and the bands broadened significantly. The Raman spectrum of the material quenched from 31.3 GPa to ambient conditions indicated that no pressure-driven permanent reconstructive modification or decomposition of the PETN structure occurred. That is, the spectral changes were completely reversible upon compression and subsequent decompression to ambient conditions.
对一种晶体含能材料季戊四醇四硝酸酯C(CH2ONO2)4（PETN）进行了高压拉曼散射研究，PETN是一种重要的二次炸药。在室温下原位研究采用了金刚石对顶砧技术，并以氮气作为准静水压传递介质。在高达约31.3 GPa的压缩过程以及随后减压至环境条件的过程中，研究了拉曼线轮廓（包括位置、带宽和强度）的压力诱导变化。观察到的拉曼光谱变化表明，PETN在最高研究压力之前逐渐致密化且压缩过程顺利。低于12 GPa的压缩使所有拉曼峰逐渐向高频移动，而其相对强度或带宽没有显著变化。在更高压力下，拉曼光谱的峰强度显著降低，谱带明显变宽。从31.3 GPa淬火至环境条件的材料的拉曼光谱表明，PETN结构未发生压力驱动的永久性重构改性或分解。也就是说，在压缩以及随后减压至环境条件时，光谱变化是完全可逆的。
