Thermal Stability and Thermodynamics of the Ag 2 ZnGeS 4 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/Report/Conference proceedingConference contributionScientificpeer-review

3 Citations (Scopus)


Phase equilibria in the ZnS–Ag 2 GeS 3 –Ge–GeS 2 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 Ag 2 GeS 3 –ZnS polythermal section. Further, the mechanism of formation and thermal stability of the Ag 2 ZnGeS 4 compound were established. The results suggest the presence of another quaternary phase Ag 4 ZnGe 2 S 7 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 Ag 2 ZnGeS 4 quaternary phase were derived for the first time. The calculated Gibbs energy, enthalpy and entropy values of the Ag 2 ZnGeS 4 compound in both phase regions are consistent, which indicates that Ag 2 ZnGeS 4 has stoichiometric composition.

Original languageEnglish
Title of host publicationMaterials Processing Fundamentals 2019
EditorsAntoine Allanore, Guillaume Lambotte, Samuel Wagstaff, Jonghyun Lee
Number of pages12
ISBN (Electronic)978-3-030-05728-2
Publication statusPublished - 10 Feb 2019
MoE publication typeA4 Article in a conference publication
EventMaterials Processing Fundamentals Symposium - San Antonio, United States
Duration: 10 Mar 201914 Mar 2019

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


ConferenceMaterials Processing Fundamentals Symposium
Country/TerritoryUnited States
CitySan Antonio


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


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