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Raman scattering under pressure and the phase transition in ε‐GaSe
Author(s) -
Kulibekov A. M.,
Olijnyk H. P.,
Jephcoat A. P.,
Salaeva Z. Y.,
Onari S.,
Allakhverdiev K. R.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301613
Subject(s) - raman scattering , raman spectroscopy , phase transition , diamond anvil cell , ambient pressure , materials science , helium , phase (matter) , crystal (programming language) , x ray raman scattering , scattering , diamond , analytical chemistry (journal) , chemistry , high pressure , optics , condensed matter physics , thermodynamics , composite material , physics , organic chemistry , chromatography , computer science , programming language
Raman scattering in ε‐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 ε‐GaSe at ambient conditions most probably belongs to the γ‐type as characterised by an increased intensity of the Raman modes at 234 cm –1 and 250 cm –1 .