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Thermal Stability and Thermodynamics of the Ag2ZnGeS4 Compound

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Materials Processing Fundamentals 2019

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

Abstract

Phase equilibria in the ZnS–Ag2GeS3–Ge–GeS2 part of the Ag–Zn–Ge–S system were investigated using differential thermal analysis, X-ray diffraction, and EMF methods. The data was used to model Ag2GeS3–ZnS polythermal section. Further, the mechanism of formation and thermal stability of the Ag2ZnGeS4 compound were established. The results suggest the presence of another quaternary phase Ag4ZnGe2S7 in the temperature range of 695–853 K. The determined phase relations were used to express the chemical reactions. Based on the electromotive force versus temperature measurements, experimental thermodynamic data of the Ag2ZnGeS4 quaternary phase were derived for the first time. The calculated Gibbs energy , enthalpy and entropy values of the Ag2ZnGeS4 compound in both phase regions are consistent, which indicates that Ag2ZnGeS4 has stoichiometric composition.

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Acknowledgements

The authors are grateful to the Academy of Finland for financial support. This work was made under the 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 Centre at Åbo Akademi University. In addition, funding from the Academy of Finland project “Behavior and properties of molten ash in biomass and waste combustion” (Decision number 266384) for M. Moroz and D. Lindberg is greatly appreciated.

Author information

Authors and Affiliations

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

    Mykola Moroz, Fiseha Tesfaye & Leena Hupa

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

    Pavlo Demchenko

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

    Myroslava Prokhorenko

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

    Daniel Lindberg

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

    Oleksandr Reshetnyak

Authors
  1. Mykola Moroz
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  2. Fiseha Tesfaye
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  3. Pavlo Demchenko
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  4. Myroslava Prokhorenko
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  5. Daniel Lindberg
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  6. Oleksandr Reshetnyak
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  7. Leena Hupa
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Corresponding author

Correspondence to Mykola Moroz .

Editor information

Editors and Affiliations

  1. Boston Metal, Woburn, MA, USA

    Guillaume Lambotte

  2. Iowa State University, Ames, IA, USA

    Jonghyun Lee

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

    Antoine Allanore

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

    Samuel Wagstaff

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Moroz, M. et al. (2019). Thermal Stability and Thermodynamics of the Ag2ZnGeS4 Compound. In: Lambotte, G., Lee, J., Allanore, A., Wagstaff, S. (eds) Materials Processing Fundamentals 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05728-2_20

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