Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA.
Department of Chemistry, Sogang University, Seoul 121-742, South Korea.
J Chem Phys. 2018 Apr 7;148(13):134310. doi: 10.1063/1.5021976.
Hydrazinium azide (HA) has been investigated at high pressures to 68 GPa using confocal micro-Raman spectroscopy and synchrotron powder x-ray diffraction. The results show that HA undergoes structural phase transitions from solid HA-I to HA-II at 13 GPa, associated with the strengthening of hydrogen bonding, and then to N at 40 GPa. The transformation of HA to recently predicted N (N≡N-N-N=N-N-N≡N) is evident by the emergence of new peaks at 2384 cm, 1665 cm, and 1165 cm, arising from the terminal N≡N stretching, the central N=N stretching, and the N-N stretching, respectively. However, upon decompression, N decomposes to ε-N below 25 GPa, but the remnant can be seen as low as 3 GPa.
叠氮化氢（HA）在高达 68 GPa 的高压下使用共聚焦微拉曼光谱和同步加速器粉末 X 射线衍射进行了研究。结果表明，HA 经历了从固态 HA-I 到 13 GPa 的 HA-II 的结构相变，伴随着氢键的增强，然后在 40 GPa 转变为 N。HA 转化为最近预测的 N（N≡N-N-N=N-N≡N）是通过在 2384 cm、1665 cm 和 1165 cm 处出现新峰来证明的，这些峰分别来自末端 N≡N 拉伸、中心 N=N 拉伸和 N-N 拉伸。然而，在减压过程中，N 在低于 25 GPa 时分解为 ε-N，但在低至 3 GPa 时仍可观察到残余物。
