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Transformation of hydrazinium azide to molecular N 8 at 40 GPa.
Journal of Chemical Physics 2018 April 8
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 N8 at 40 GPa. The transformation of HA to recently predicted N8 (N≡N+ -N- -N=N-- N-+ N≡N) is evident by the emergence of new peaks at 2384 cm-1 , 1665 cm-1 , and 1165 cm-1 , arising from the terminal N≡N stretching, the central N=N stretching, and the N-N stretching, respectively. However, upon decompression, N8 decomposes to ε-N2 below 25 GPa, but the remnant can be seen as low as 3 GPa.
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