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The thermodynamic properties of the BiTe system were studied in the 55-65 at% Te compositions interval and temperatures 300-450 K by using the electromotive forces method. Relative partial molar functions of bismuth in the alloys were calculated. Based on the potential-forming reactions for Bi 2 Te 3 and Bi 4 Te 5 compounds, a mutually consistent set of standard thermodynamic functions and standard entropies is obtained. A comparative analysis of the data obtained for Bi 2 Te 3 with literature is performed, for Bi 4 Te 5 thermodynamic functions were obtained for the first time.

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Two-phase alloys Bi8Te9+Bi4Te5 and BiTe+Bi8Te9 were studied by the electromotive forces method (EMF) in the temperature range 300-450 K. From the EMF data, the relative partial molar functions of bismuth in the alloys were calculated. The potential-forming reactions responsible for these partial functions were compiled, the values of the standard thermodynamic functions of formation, and the standard entropies of Bi8Te9 and BiTe compounds were calculated. A comparative analysis of the data for BiTe with the literature data was carried out; for Bi8Te9, the thermodynamic functions were obtained for the first time.

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