Abstract
The phase diagram of the Cu-As-Se ternary system was studied by differential thermal analysis, X-ray diffraction and metallography analysis. Two ternary phases are observed: the Cu3AsSe4 compound, which melts congruently, and the CuAsSe2 compound, which undergoes a peritectic decomposition. The ternary system is subdivided into 12 secondary triangles. The 12 ternary invariants are localized: six eutectics, one of which is degenerated at the selenium apex, and six peritectics. Two ternary liquid-liquid miscibility gaps originating from the Cu-Se binary system are identified. One of these is crossed by a eutectic valley giving a first-class ternary monotectic equilibrium. A large vitreous region, which comes from the As-Se binary glass zone, is identified; it overlaps the liquid-liquid miscibility area, giving phase-separated glasses.
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