Abstract
The Sn-Bi-Te system has been studied in the composition region SnTe-Bi2Te3-Te at temperatures from 300 to 430 K using emf measurements on reversible concentration cells of the type $$ ( - )SnTe(s)|liquid electrolyte, Sn^{2 + } |(Sn - Bi - Te)(s)( + ) $$ The subsolidus phase diagram inferred from the emf data includes the ternary compounds SnBi2Te4, SnBi4Te7, and SnBi6Te10 and a broad (0–25 mol % SnTe) range of Bi2Te3-based solid solutions. Best fit equations for the temperature-dependent emf data were used to determine the differences between the partial thermodynamic functions (\( \overline {\Delta G} ,\overline {\Delta H} \) and \( \overline {\Delta S} \)) of the Sn in SnTe and SnTe-Bi2Te3-Te alloys. From these partial molar functions, we calculated the standard thermodynamic functions of formation and standard entropies of the β-solution and ternary compounds by integrating the Gibbs-Duhem equation along the SnTe-Bi2Te3 join with the use of the relevant data for SnTe and Bi2Te3.
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