Abstract
The Pb-Bi-Te system has been studied in the composition region PbTe-Bi2Te3-Te at temperatures from 300 to 430 K using emf measurements on reversible concentration cells of the type $$( - )PbTe(s)|liquid electrolyte, Pb^{2 + } |(Pb - Bi - Te)(s)( + ).$$ . The subsolidus phase diagram inferred from the emf data includes the ternary compounds PbBi6Te10, PbBi4Te7, Pb2Bi6Te11, and PbBi2Te4 of the nPbTe · mBi2Te3 homologous series. Best fit equations for the temperature-dependent emf data were used to determine the partial thermodynamic functions (\(\overline {\Delta G} \), \(\overline {\Delta H} \), and \(\overline {\Delta S} \)) of the PbTe in the alloys. Using these partial molar functions, subsolidus phase diagram data for the PbTe-Bi2Te3-Te system, and relevant data for PbTe and Bi2Te3, we calculated the standard thermodynamic functions of formation and standard entropies of the above ternary compounds.
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