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

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Interna författare/redaktörer


Publikationens författare: Mykola Moroz, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Daniel Lindberg, Oleksandr Reshetnyak, Leena Hupa
Redaktörer: Jonghyn Lee, Samuel R. Wagstaff, Guillaume Lambotte, Antoine Allanore, Fiseha Tesfaye
Förlagsort: Switzerland AG
Publiceringsår: 2020
Förläggare: Springer
Moderpublikationens namn: Materials Processing Fundamentals 2020
Seriens namn: The Minerals, Metals & Materials Series
Artikelns första sida, sidnummer: 275
Artikelns sista sida, sidnummer: 287
ISBN: 978-3-030-36555-4
eISBN: 978-3-030-36556-1
ISSN: 2367-1181


Abstrakt

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.


Nyckelord

EMF method, Phase equilibria, Renewable energy, Thermodynamic properties, Thermoelectric Materials

Senast uppdaterad 2020-07-04 vid 07:39