High-pressure phase transitions of solid H{sub 2}S probed by Fourier-transform infrared spectroscopy
- Department of Electronics and Computer Engineering, Gifu University, 1-1 Yanagido, Gifu 501-11 (Japan)
- National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305 (Japan)
Infrared-absorption spectra of solid H{sub 2}S have been measured at high pressures up to 50 GPa and room temperature. The symmetric stretching overtone vibration 2{nu}{sub 1} shows a redshift in frequency with increasing pressure, and changes into two components at about 11 GPa for the II-IV phase transition. The pressure dependence of the observed 2{nu}{sub 1}, {nu}{sub 2}+{nu}{sub 3} (bending plus asymmetric-stretching combination bands), and {nu}{sub 2} vibrations shows strongly the existence of the phase transition from IV to V at about 30 GPa, which is consistent with a recent high-pressure x-ray study. The derived frequencies of fundamental {nu}{sub 1} and {nu}{sub 3} vibrations continue to decrease with pressure up to the IV{r_arrow}V phase transition, and show small jumps at its point and moreover decrease slightly up to 45 GPa. The S-H---S hydrogen-bond system still exists up to at least 45 GPa; however, its bonding is very weak. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 467379
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 9; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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