Thermodynamic Properties of Superionic Phase Ag4HgSe2I2 Determined by the EMF Method

Mykola Moroz, Fiseha Tesfaye, Myroslava Prokhorenko, Serhiy Prokhorenko, Oleksandr Reshetnyak

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    Abstract

    Triangulationof the Ag-Hg-Se-I system in the vicinity of quaternaryphase Ag4HgSe2I2 was performed by differentialthermal analysis, X-ray diffraction and electromotive force (EMF) methods. The spatial position of the phase region Ag4HgSe2I2-Se-HgI2regarding the figurative pointof silver was used to write the chemical reaction of formation of Ag4HgSe2I2. The EMF measurements were carried out by applying an electrochemical cell: (–) C | Ag | Ag2GeS3 glass | Ag4HgSe2I2,HgI2, Se | C (+), where C is graphite and Ag2GeS3 glassis the fast purely Ag+ ions conducting electrolyte. The lineardependence of the EMF of the electrochemical cell on temperature was used to determinethe standard thermodynamic values of Ag4HgSe2I2 forthe first time.

    Original languageUndefined/Unknown
    Pages (from-to)11–16
    JournalJournal of Phase Equilibria and Diffusion
    Volume39
    Issue number1
    DOIs
    Publication statusPublished - 2018
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Phase equilibria
    • Thermodynamics
    • EMF technique
    • Gibbs energy

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