Structural inhomogeneity of melts in quasi-binary systems formed by copperchalcogenides

The temperature and concentration dependences of kinematic viscosity and de nsity of melts in quasi-binary systems formed by copper chalcogenides were studied. The temperature dependences of melt properties were analyzed based on the theory of the activated complex and the fundamental equation sugges ted by A.I. Bachinskii. In all melts, postmelting effects were observed; in the systems under consideration, these effects were related to heating-ind uced structural changes in the melts due to the transformation of structura lly inhomogeneous liquids into homogeneous Newton liquids as a result of th ermal decomposition of clusters. It was also shown that the concentration d ependences of viscosity were smooth, and those of density strictly additive . This is evidence for intermolecular interaction, the idea of which follow s from consideration of the phase diagrams of the corresponding quasi-binar y systems and a thermodynamic analysis.