PHASE EQUILIBRIA AT THE ISOTHERMAL SECTIONS OF THE QUASI-TERNARY SYSTEMS Ag(Cu)2X–PbX–SNX2 (X=S, Se) AT ROOM TEMPERATURE

Abstract

The isotermal sections of the quasi-ternary systems Ag(Cu)2X–PbX–SnX2 (X=S, Se) at room temperature were investigated by X-ray phase analysis. No intermediate quaternary phases were found in the systems. Intermediate alloys on the PbSe–SnSe2 side are three-phase, the alloys in the triangles bounded by this side are four-phase. The reason for this is that the PbSe–SnSe2 section is non-quasi-binary causing an unusual tetrahedration of the Ag(Cu)–Pb–Sn–Se systems that is different from the sulfide systems.