Transformation of hydrazinium azide to molecular N8 at 40 GPa
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 06, 2018
- Source ID
- 10.1063/1.5021976
Entities
People
- Choong-Shik Yoo
- Kyungtae Kim
- Minseob Kim
- Nam Hwi Hur
- Sakun Duwal
- Sora Bang
- Young-Jay Ryu
Organizations
- Agency for Defense Development
- Army Research Office
- Naval Surface Warfare Center
- Sogang University
- Washington State University