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Thermodynamic properties of copper thallium tellurides

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Abstract

The Cu-Tl-Te system has been studied in the composition region Cu-CuTe-Cu2TlTe2 using emf measurements on reversible concentration cells relative to a thallium electrode. The partial subsolidus phase diagram inferred from the emf data includes the ternary compounds Cu9TlTe5, Cu3TlTe2, and Cu2TlTe2. The emf data were used to evaluate the relative partial thermodynamic functions (\( \Delta \bar G \), \( \Delta \bar H \) and \( \Delta \bar S \)) of the thallium in the alloys. From the subsolidus phase diagram, we identified the potential-determining reactions responsible for these functions and calculated the standard thermodynamic functions of formation and standard entropies of the ternary compounds Cu9TlTe5 (−Δf G 0(298 K) = 244.0 ± 2.4 kJ/mol, −Δf H 0(298 K) = 241 ± 14 kJ/mol, S 0(298 K) = 621 ± 7 J/(mol K)), Cu3TlTe2 (117.1 ± 1.2, 117 ± 5, 264 ± 4), and Cu2TlTe2 (94.8 ± 0.9, 92 ± 7, 237 ± 3).

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Authors and Affiliations

  1. Baku State University, ul. Khalilova 23, Baku, AZ1148, Azerbaijan

    M. B. Babanly & S. Z. Imamalieva

  2. Azerbaijani Technical University, pr. Javida 25, Baku, AZ1073, Azerbaijan

    Z. E. Salimov

  3. Institute of Chemical Problems, Academy of Sciences of Azerbaijan, pr. Javida 29, Baku, AZ1143, Azerbaijan

    N. B. Babanly

Authors
  1. M. B. Babanly
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  2. Z. E. Salimov
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  3. N. B. Babanly
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  4. S. Z. Imamalieva
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Correspondence to M. B. Babanly.

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Original Russian Text © M.B. Babanly, Z.E. Salimov, N.B. Babanly, S.Z. Imamalieva, 2011, published in Neorganicheskie Materialy, 2011, Vol. 47, No. 4, pp. 415–418.

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Babanly, M.B., Salimov, Z.E., Babanly, N.B. et al. Thermodynamic properties of copper thallium tellurides. Inorg Mater 47, 361–364 (2011). https://doi.org/10.1134/S0020168511040030

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