Thermal Stability and Thermodynamics of the Ag2ZnGeS4 Compound

Mykola Moroz, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Daniel Lindberg, Oleksandr Reshetnyak*, Leena Hupa

*Corresponding author for this work

    Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review

    2 Citations (Scopus)
    8 Downloads (Pure)


    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.

    Original languageEnglish
    Title of host publicationMaterials Processing Fundamentals 2019
    EditorsGuillaume Lambotte, Jonghyun Lee, Antoine Allanore, Samuel Wagstaff
    PublisherSpringer, Cham
    ISBN (Electronic)978-3-030-05728-2
    ISBN (Print)978-3-030-05727-5
    Publication statusPublished - 2019
    MoE publication typeA4 Article in a conference publication
    EventMaterials Processing Fundamentals Symposium - Materials Processing Fundamentals Symposium
    Duration: 1 Jan 2019 → …

    Publication series

    NameThe Minerals, Metals & Materials Series
    PublisherSpringer International Publishing


    ConferenceMaterials Processing Fundamentals Symposium
    Period01/01/19 → …


    • Chalcogenide semiconductors
    • EMF method
    • Gibbs' free energy
    • Phase equilibria
    • Thermodynamic properties


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