The Enthalpies of Binary Mixtures of Chalcogen Elements

Abstract

Abstract The enthalpies of binary mixtures among chalcogen elements were measured by means of calorimetry. In the system of sulfur+selenium, the positive enthalpy increment suggests the formation of a co-ring and a co-chain on mixing. In the selenium+tellurium and sulfur+tellurium systems, some local ordered structures were deduced from the minimum points of the enthalpy at the compositions of Te3Se2 and Te3S. In the latter system, the entropy of mixing was calculated from the reported phase diagram and the present enthalpy values. The entropy diagram also suggests that the local order is present.