Phase equilibria in the Cu-Cu2S-As system

Phase equilibria in the Cu-Cu₂S-Assystem have been studied by DTA and X-ray powder diffraction. Cu_0.667S_0.333-As, Cu_0.667S_0.333-Cu_0.735As_0.265, and Cu_0.8S_0.2-As polythermal sections, an isothermal section at 300 K, and the liquidus projection have been constructed. Our data differ from reported data in the extents of primary crystallization phase fields and the coordinates of some invariant equilibrium points.