Phase Relations in the Zn3As2–ZnAs2–CdAs2–Cd3As2 System

Phase relations along the Cd₃As₂–ZnAs₂ and Zn₃As₂–CdAs₂ joins are studied by differential thermal analysis, x-ray diffraction, and microstructural analysis. The results, in conjunction with earlier data on the CdAs₂–ZnAs₂, Zn₃As₂–Cd₃As₂, Cd₃As₂–CdAs₂, and ZnAs₂–Zn₃As₂ binaries, are used to map out the phase diagram of the liquidus surface in the composition region Zn₃As₂–ZnAs₂–CdAs₂–Cd₃As₂ of the ternary system Cd–As–Zn. The ternary eutectic revealed in this region has an approximate composition of 26 at. % Cd + 65 at. % As + 9 at. % Zn and melts at 863 K.