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Thermodynamic Properties of Layered Tetradymite-like Compounds of the Ag–Ge–Sb–Te System

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Materials Processing Fundamentals 2020

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

The phase equilibria of the Ag–Ge–Sb–Te system in the part Ag8GeTe6–Ge–GeTe–Sb2Te3 were investigated by the electromotive force (EMF) method. The determined phase relations were used to express the chemical reactions. The potential-forming reactions were performed by applying electrochemical cells (−) C | Ag | Ag2GeS3-glass | D | C (+), where C is graphite, Ag2GeS3-glass is the fast purely Ag+ ions conducting electrolyte, and D is an equilibrium mixture of phases. According to the experimental data on the EMF versus temperature of each electrochemical cells, analytical equations for the Gibbs energies of GeSb8Te13, GeSb6Te10, GeSb4Te7, GeSb2Te4, Ge2Sb2Te5, Ge3Sb2Te6, and Ge4Sb2Te7 compounds were obtained. The thermodynamic properties of silver-saturated tetradymite-like compounds have been calculated for the first time. A good correspondence between experimental values and structure data reported in the literature has been established.

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Acknowledgements

This work was partially supported by the Ministry of Education and Science of Ukraine (grant No. 0119U002208). This work was also financially supported by the Academy of Finland project “Thermodynamic investigation of complex inorganic material systems for improved renewable energy and metals production processes” (Decision number 311537), as part of the activities of the Johan Gadolin Process Chemistry Center at Åbo Akademi University.

Conflict of Interest

The authors declare that they have no conflict of interest.

Author information

Authors and Affiliations

  1. Department of Chemistry and Physics, National University of Water and Environmental Engineering, Rivne, 33028, Ukraine

    M. Moroz

  2. Department of Physical and Colloid Chemistry, Ivan Franko National University of Lviv, Lviv, 79005, Ukraine

    M. Moroz & O. Reshetnyak

  3. Laboratory of Inorganic Chemistry, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500, Turku, Finland

    F. Tesfaye & L. Hupa

  4. Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Lviv, 79005, Ukraine

    P. Demchenko

  5. Department of Cartography and Geospatial Modeling, Lviv Polytechnic National University, Lviv, 79013, Ukraine

    M. Prokhorenko

  6. School of Chemical Engineering, Aalto University, 02150, Espoo, Finland

    D. Lindberg

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Correspondence to M. Moroz .

Editor information

Editors and Affiliations

  1. Iowa State University, Ames, IA, USA

    Jonghyun Lee

  2. Novelis, Kennesaw, GA, USA

    Samuel Wagstaff

  3. Boston Metal, Woburn, MA, USA

    Guillaume Lambotte

  4. Massachusetts Institute of Technology, Cambridge, MA, USA

    Antoine Allanore

  5. Åbo Akademi University, Turku, Finland

    Fiseha Tesfaye

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Moroz, M. et al. (2020). Thermodynamic Properties of Layered Tetradymite-like Compounds of the Ag–Ge–Sb–Te System. In: Lee, J., Wagstaff, S., Lambotte, G., Allanore, A., Tesfaye, F. (eds) Materials Processing Fundamentals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36556-1_23

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