High-Pressure Studies of Rubidium Azide by Raman and Infrared Spectroscopies

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• 作者：Dongmei Li ; Fangfei Li ; Yan Li ; Xiaoxin Wu ; Guangyan Fu ; Zhenxian Liu ; Xiaoli Wang ; Qiliang Cui ; Hongyang Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：July 23, 2015
• 年：2015
• 卷：119
• 期：29
• 页码：16870-16878
• 全文大小：705K
• ISSN：1932-7455

文摘

We report the high-pressure studies of RbN₃ by Raman and IR spectral measurements at room temperature with the pressure up to 28.5 and 30.2 GPa, respectively. All the fundamental vibrational modes were resolved by combination of experiment and calculation. Detailed spectroscopic analyses reveal two phase transitions at 鈭?.5 and 鈭?6.0 GPa, respectively. Upon compression, the shearing distortion of the unit cell induced the displacive structural transition of phase 伪 鈫?纬. Further analyses of the mid-IR spectra indicate the evolution of N₃^{鈥?/sup> with the arrangement sequence of orthogonal 鈫?parallel 鈫?orthogonal during the phase transition of phase 伪 鈫?纬 鈫?未. Additionally, the pressure-induced nonlinear/asymmetric existence of N鈺怤鈺怤 and the two crystallographically nonequivalent sites of N₃鈥?/sup> were observed in phase 未.}