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Structural Phase Transitions of Ga 2 Se 3 and GaSe under High Pressure
Author(s) -
Takumi M.,
Hirata A.,
Ueda T.,
Koshio Y.,
Nishimura H.,
Nagata K.
Publication year - 2001
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 - 10.1002/1521-3951(200101)223:2<423::aid-pssb423>3.0.co;2-5
Subject(s) - diffraction , phase transition , phase (matter) , synchrotron radiation , high pressure , x ray crystallography , synchrotron , materials science , crystallography , chemistry , analytical chemistry (journal) , thermodynamics , optics , physics , chromatography , organic chemistry
High pressure X‐ray powder diffraction studies have been made on α‐Ga 2 Se 3 up to 27 GPa andε‐GaSe up to 64 GPa by using synchrotron radiation. A structural phase transition is observed for α‐Ga 2 Se 3 at 14 GPa, as is observed in β‐Ga 2 Se 3 . The diffraction patterns of the high pressure phases of α‐ and β‐Ga 2 Se 3 are almost the same, showing that the structures of the high pressure phases of both α‐ and β‐Ga 2 Se 3 are the same. On the other hand, the structural phase transition for ε‐GaSe is observed near 25 GPa. The diffraction pattern of the high pressure phase of GaSe is similar to that of Ga 2 Se 3 . This shows that the high pressure phase of GaSe is similar to that of Ga 2 Se 3 , although the atomic concentrations in the alloys are different between Ga 2 Se 3 and GaSe. Most of the diffraction profile of the high pressure phase is explained by a NaCl type structural model, suggesting that the high pressure phase has a structure similar to NaCl.