Phases, lattice parameters and thermal expansion of (Ga_xIn_1−x)₂Se₃, 1≥x≥0, between room temperature and melting point

The phases, their lattice parameters and the linear coefficient of the lattice thermal expansion were determined by high-temperature X-ray diffraction between room temperature and the melting point for the system (Ga_xIn_{1 −x})₂Se₃ (1 ≥x≥ 0). A wide homogeneity range of zinc blende structure was found in the Ga-rich region when a certain critical temperature was reached. In the In-rich region the alloys were isostructural with γ-In₂Se₃ at all temperatures, and the linear thermal-expansion coefficient was composition dependent.