Phase equilibria in the Ag₈GeS₆-Ag₈GeTe₆ and Ag₈GeSe₆-Ag₈GeTe₆ systems were studied using differential thermal analysis and powder X-ray diffraction technique. The T-x phase diagrams were constructed.  It has been found that both systems are partially quasi-binary and are characterized by the formation of continuous series of substitutional solid solutions between Ag₈GeTe₆ and high-temperature cubic modifications of Ag₈GeS₆ and Ag₈GeSe₆. When solid solutions are formed, the temperatures of polymorphic phase transitions of these compounds decrease. This leads to the stabilization of the ion-conducting cubic phase in the ³40 mol% Ag₈GeTe₆ range of compositions at room temperature and below. The regions of homogeneity based on Ag₈GeS₆ and Ag₈GeSe₆ are 15 and 10 mol.%, respectively. The crystal lattice parameters of the identified solid solutions were calculated from the XRD data, and their linear dependence on the composition is shown

doi.org/10.32737/0005-2531-2023-1-22-29