Thermodynamic properties of the SnSb2Te4 compound

The SnTe–Sb₂Te₃–Te system has been studied in the temperature range 300–430 K using emf measurements on reversible concentration cells of the type (–)SnTe(s) | liquid electrolyte, Sn²⁺ |(Sn–Sb–Te)(s)(+). The system has been shown to consist of two three-phase regions, separated by the SnSb₂Te₄–Te tie line. The best fit equation for the temperature-dependent emf data has been used to evaluate the partial thermodynamic functions of the SnTe and Sn in the alloys. Using these data, subsolidus phase diagram data for the SnTe–Sb₂Te₃–Te system, and relevant thermodynamic functions for SnTe and Sb₂Te₃, we calculated the standard Gibbs energy of formation, standard enthalpy of formation, and standard entropy of the SnSb₂Te₄ compound.