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

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