高压下硝酸肼结构演化的中远红外光谱和第一性原理计算研究  

Mid-and Far-Infrared Spectroscopic and First-Principles Computational Study of the Structural Evolution of Hydrazine Nitrate under High Pressure

作　　者：曾阳阳 朱刚贝 王文涛[2] 白莎 郑朝阳[1] 于国洋[1] 杨延强[1] ZENG Yangyang;ZHU Gangbei;WANG Wentao;BAI Sha;ZHENG Zhaoyang;YU Guoyang;YANG Yanqiang(Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;College of Chemistry and Materials Science,Northwest University,Xi’an 710127,Shaanxi,China)

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621999 [2]中国科学院大连化学物理研究所,辽宁大连116023 [3]西北大学化学与材料学院,陕西西安710127

出　　处：《高压物理学报》2024年第3期103-110,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(U2030113);冲击波物理与爆轰物理全国重点实验室基金(2021JCJQLB05712);中国科学院重点实验室基金(CXJJ-22S034)。

摘　　要：对于含能材料,6 THz(200 cm^(-1))以内的晶格振动模式对外部压力变化引起的结构变化非常敏感,因此,中远红外振动光谱可作为研究含能材料高压相变的有力手段。利用基于空气等离子体产生的中远红外超宽带光谱技术,结合金刚石对顶砧,获得了含能材料硝酸肼的高压振动光谱。同时,采用第一性原理方法,计算了硝酸肼的晶体结构和红外光谱,在此基础上对分子间的相互作用进行了分析。综合实验和计算结果,揭示了压力作用下分子间氢键和范德瓦尔斯相互作用对材料中分子结构和堆垛变化的影响,获得了硝酸肼的相变过程。For energetic materials,the lattice vibration modes in the 6 THz(200 cm^(-1))range are very sensitive to structural changes caused by external temperature and pressure changes.Therefore,mid-and farinfrared vibrational spectroscopy can be used as a powerful tool to study high-pressure phase transitions in these materials.We have obtained high-pressure vibrational spectra of hydrazine nitrate,using mid-and farinfrared ultra-broadband spectroscopy,whose broadband was generated by air plasma,combined with a diamond anvil cell(DAC).The crystal structure of hydrazine nitrate,as well as the infrared spectrum,were calculated by using the first principle method.Based on the calculation,the intermolecular interactions were analyzed.Combined with the experimental results,it was revealed that the structural changes under pressure alter the strength of intermolecular hydrogen bonds and van der Waals interactions,which in turn affects the low-frequency vibrational modes.And by analyzing the vibrational spectra,we observed the phase transition process of hydrazine nitrate.

关 键 词：硝酸肼 中远红外光谱 第一性原理计算 高压 相变 

分 类 号：O521.2[理学—高压高温物理]