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Article

The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System

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Department of Chemistry and Physics, National University of Water and Environmental Engineering, 33028 Rivne, Ukraine
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Department of Physical and Colloid Chemistry, Ivan Franko National University of Lviv, 79005 Lviv, Ukraine
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Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland
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Department of Inorganic Chemistry, Ivan Franko National University of Lviv, 79005 Lviv, Ukraine
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Department of Cartography and Geospatial Modeling, Lviv Polytechnic National University, 79013 Lviv, Ukraine
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Department of Chemical and Metallurgical Engineering, Aalto University, Kemistintie 1, 02150 Espoo, Finland
*
Authors to whom correspondence should be addressed.
Academic Editor: Lyes Bennamoun
Energies 2021, 14(5), 1314; https://doi.org/10.3390/en14051314
Received: 31 December 2020 / Revised: 21 February 2021 / Accepted: 25 February 2021 / Published: 28 February 2021
Equilibrium phase formations below 600 K in the parts Ag2Te–FeTe2–F1.12Te–Ag2Te and Ag8GeTe6–GeTe–FeTe2–AgFeTe2–Ag8GeTe6 of the Fe–Ag–Ge–Te system were established by the electromotive force (EMF) method. The positions of 3- and 4-phase regions relative to the composition of silver were applied to express the potential reactions involving the AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 compounds. The equilibrium synthesis of the set of phases was performed inside positive electrodes (PE) of the electrochemical cells: (−)Graphite ‖LE‖ Fast Ag+ conducting solid-electrolyte ‖R[Ag+]‖PE‖ Graphite(+), where LE is the left (negative) electrode, and R[Ag+] is the buffer region for the diffusion of Ag+ ions into the PE. From the observed results, thermodynamic quantities of AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 were experimentally determined for the first time. The reliability of the division of the Ag2Te–FeTe2–F1.12Te–Ag2Te and Ag8GeTe6–GeTe–FeTe2–AgFeTe2–Ag8GeTe6 phase regions was confirmed by the calculated thermodynamic quantities of AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 in equilibrium with phases in the adjacent phase regions. Particularly, the calculated Gibbs energies of Ag2FeGeTe4 in two different adjacent 4-phase regions are consistent, which also indicates that it has stoichiometric composition. View Full-Text
Keywords: silver-based compounds; thermoelectric materials; phase equilibria; thermodynamic properties; Gibbs energy; EMF method silver-based compounds; thermoelectric materials; phase equilibria; thermodynamic properties; Gibbs energy; EMF method
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MDPI and ACS Style

Moroz, M.; Tesfaye, F.; Demchenko, P.; Prokhorenko, M.; Yarema, N.; Lindberg, D.; Reshetnyak, O.; Hupa, L. The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System. Energies 2021, 14, 1314. https://doi.org/10.3390/en14051314

AMA Style

Moroz M, Tesfaye F, Demchenko P, Prokhorenko M, Yarema N, Lindberg D, Reshetnyak O, Hupa L. The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System. Energies. 2021; 14(5):1314. https://doi.org/10.3390/en14051314

Chicago/Turabian Style

Moroz, Mykola, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Nataliya Yarema, Daniel Lindberg, Oleksandr Reshetnyak, and Leena Hupa. 2021. "The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System" Energies 14, no. 5: 1314. https://doi.org/10.3390/en14051314

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