北京大学学报（自然科学版）2025，Vol.61Issue(1)：121-129,9.DOI:10.13209/j.0479-8023.2024.086
NH4Cl的高压相变及弹性性质实验研究
Phase Transitions and Elastic Properties of NH4Cl at High Pressures
摘要
Abstract
Synchrotron radiation single crystal X-ray diffraction(XRD),Raman spectroscopy and infrared spectro-scopy were used to analyze natural ammonium chloride(NH4Cl)under high pressure.The results show that NH4Cl transforms from phase IV(space group P4ത3m)to phase V(space group P4/nmm)at 13.6 GPa.The parameters of the third-order Birch-Murnaghan equation of state are determined with K0=24.9(1)GPa,V0=56.4(1)Å3,K0′=5.5 for phase IV,and K0=35(25)GPa,V0=110(11)Å3,K0′=3.8(13)for phase V.The Raman spectrum of NH4Cl shows new peaks and discontinuity at 13.7 GPa,and the Raman shift are linearly related to pressure.dνi/d P and Grüneissen parameters for each vibration of phase IV and V are obtained.The infrared spectrum of N—H vibration split at 11.7-14.8 GPa.The transition pressures from phase IV to V of NH4Cl,NH4Br and NH4I decrease in turn,which are inver-sely proportional to the anion radius.关键词
氯化铵/高压结构相变/X射线衍射/拉曼光谱/红外光谱Key words
ammonium chloride/high pressure phase transition/X-ray diffraction/Raman spectroscopy/infrared spectroscopy引用本文复制引用
张静宜,黄圣轩,秦善..NH4Cl的高压相变及弹性性质实验研究[J].北京大学学报（自然科学版）,2025,61(1):121-129,9.基金项目
国家自然科学基金(42072047)资助 （42072047）
