DTA and XRD methods were used to study phase equilibria along the Cu2GeSe3–Ag2GeSe3₃ isopleth section of the Cu₂Se–Ag₂Se–GeSe₂ system and its phase diagram was constructed. It was established that this section is non-quasibinary. In the composition range 0–55 mol% Cu2GeSe3, solid solutions on the basis of high-temperature modification of Ag₈GeSe₆ primarily crystallize from the melt, and in the range 55–100 mol% Cu2GeSe3 solid solutions based on Cu2GeSe3. Based ofCu2GeSe3, solid sub­stitution solutions were identified, the length of which at 900 K is 20 mol%, and at room temperature – 10 mol%

https://doi.org/10.32737/0005-2531-2019-3-52-56