Abstract
The SnTe–Sb2Te3 system was investigated by using EMF measurements of reversible concentration cells relative to the SnTe electrode in the 300–400 K temperature range. The formation of solid solutions (up to 20 mol%) based on Sb2Te3 was confirmed. Based on EMF measurements, the equations of the temperature dependences of the EMF for solid solutions based on Sb2Te3 with compositions of 5, 10, and 20 mol% SnTe were obtained and these results were furtherly used to calculate the partial thermodynamic functions of SnTe in alloys. The standard thermodynamic functions of the formation of solid solutions of the above compositions were calculated by graphical integration of the Gibbs-Duhem equation along the SnTe–Sb2Te3 section
Highlights
The ternary tetradymite-like compounds formed in the AIVTe–BV2Те3 (AIV–Ge, Sn, Pb; BV–Sb, Bi) systems have been intensively studied for many years as promising thermoelectrics with low thermal conductivity [1–4] and as materials with a phase transition [5, 6]
In [27], we presented a new refined phase diagram of the SnTe–Sb2Te3 system and there is a new compound with the SnSb4Te7 composition, in addition to known SnSb2Te4
This work presents the results of studying the thermodynamic properties of solid solutions based on Sb2Te3 in the SnTe–Sb2Te3 system using electromotive force (EMF) method
Summary
The ternary tetradymite-like compounds formed in the AIVTe–BV2Те3 (AIV–Ge, Sn, Pb; BV–Sb, Bi) systems have been intensively studied for many years as promising thermoelectrics with low thermal conductivity [1–4] and as materials with a phase transition [5, 6]. Various modifications of the EMF method with liquid [13–18] and solid [13, 14, 19– 21] electrolytes are successfully used in such complex studies of chalcogenide systems. The thermodynamic properties of the SnSb2Te4 compound are studied by the EMF method in [26].
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