期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 235, 期 2, 页码 517-520出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.200301613
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Raman scattering in epsilon-GaSe has been investigated at room temperature in a diamond anvil cell by using helium gas as a pressure transmitting medium. The first observation of the solid-solid phase transition under pressure from a hexagonal structure at ambient pressure to a NaCl-type at around 29.2 GPa is reported. A photoinduced change in the pressurised crystal was observed. The transition under pressure was found to be irreversible at room temperature. It was shown that the pressurised form of epsilon-GaSe at ambient conditions most probably belongs to the gamma-type as characterised by an increased intensity of the Raman modes at 234 cm(-1) and 250 cm(-1).
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