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Hydrostatic Deformation Potentials and Phase Transitions in CuGa(S x Se 1− x ) 2 Alloys at High Pressure
Author(s) -
González J.,
Calderón E.,
Capet F.
Publication year - 1995
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.2221870114
Subject(s) - hydrostatic pressure , hydrostatic equilibrium , deformation (meteorology) , absorption edge , phase (matter) , materials science , phase transition , condensed matter physics , band gap , crystallography , analytical chemistry (journal) , chemistry , thermodynamics , physics , organic chemistry , quantum mechanics , chromatography , composite material
The optical absorption edge of CuGa(S x Se 1− x ) 2 single crystals is measured as a function of hydrostatic pressure, covering the full stability range (0 to 30GPa) of the chalcopyrile phase. For 0 ⩽ x ⩽ 1, a linear increase of the direct energy gap with pressure is found. The corresponding gap deformation potential is calculated to be −4.5 eV for x = 0, −5.2 eV for x = 0.5, and −4.4 eV for x = 1. From changes in the light transmission characteristic of the samples under pressure, structural first‐order phase transitions are observed.