Pressure-induced phase transition in solid hydrogen sulfide at 11 GPa

• DOI: 10.1063/1.461002
• Publication Date: 2002-07-26T12:21:38Z
• Authors: H. Shimizu; Y. Nakamichi; S. Sasaki
• Keywords: Diamond anvil cell; Antisymmetric relation

The Raman spectra of hydrogen-bonded molecular solid H2S have been measured up to 23 GPa at 300 K in a gasketed diamond-anvil cell. In the orientationally disordered phase I between 0.47 and 11 GPa, symmetric stretching mode ν1 shows red-shift frequency (dν1/dP=−10.1 cm−1/GPa ) dramatic broadening with pressure. At about antisymmetric band ν3 appears higher-frequency side ν1. Near this same pressure five low-frequency vibrational modes also appear show pressure-sensitive features. These results indicate pressure-induced transition near GPa. This new phase, which persists least K, seems be as previously found above 3.3 25 K.