Systeme Ga2S3CdS etude cristallographique - diagramme de phase

This system is studied by D.T.A., X-ray diffraction and specially by the Guinier-Lenné method. Six intermediate phases are described. For n = 0.33 ($\text{n}\text{=}\text{Cd}\text{Cd+Ga}$) a compound CdGa₂S₄ which has two forms : one, α, stable at every temperature of the solid state, is tetragonal CdGa₂S₄-type ; the other, β, obtained only by quenching from the liquid, is an orthorhombic superstructure of the wurtzite. CdGa₂S₄ melts incongruenthy at 930°C. From n = 0.05 through n = 0.12 a solid solution of wurtzite-type (T > 950°C). In the neighbouring of n = 0.10 a solid solution of the blende-type (806°C < T < 906°C). For n = 0.70 a compound of the wurtzite-type which congruenthy melts at 960°C. From n = 0.85 through CdS a solid solution of the wurtzite-type (800°C < T < 900°C). A phase diagram is proposed.