Experimental Thermodynamic Characterization of the Chalcopyrite-Based Compounds in the Ag–In–Te System for a Potential Thermoelectric Application

Mykola Moroz (), Fiseha Tesfaye (), Pavlo Demchenko, Emanuela Mastronardo, Oksana Mysina, Myroslava Prokhorenko, Serhiy Prokhorenko, Daniel Lindberg, Oleksandr Reshetnyak and Leena Hupa
Additional contact information
Mykola Moroz: Department of Chemistry and Physics, National University of Water and Environmental Engineering, 33028 Rivne, Ukraine
Fiseha Tesfaye: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland
Pavlo Demchenko: Department of Inorganic Chemistry, Ivan Franko National University of Lviv, 79005 Lviv, Ukraine
Emanuela Mastronardo: Department of Engineering, University of Messina, 98166 Messina, Italy
Oksana Mysina: Department of Chemistry and Physics, National University of Water and Environmental Engineering, 33028 Rivne, Ukraine
Myroslava Prokhorenko: Department of Cartography and Geospatial Modeling, Lviv Polytechnic National University, 79013 Lviv, Ukraine
Serhiy Prokhorenko: Department of Measuring Information Technologies, Lviv Polytechnic National University, 79013 Lviv, Ukraine
Daniel Lindberg: Department of Chemical and Metallurgical Engineering, Aalto University, Kemistintie 1, 02150 Espoo, Finland
Oleksandr Reshetnyak: Department of Physical and Colloid Chemistry, Ivan Franko National University of Lviv, 79005 Lviv, Ukraine
Leena Hupa: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland

Energies, 2022, vol. 15, issue 21, 1-12

Abstract: The equilibrium concentration space of the Ag–In–Te system in the part AgInTe 2 –Te–In 2 Te 3 was studied through the modified solid-state electromotive force (EMF) method by dividing In 2 Te 3 –In 2 Te 5 –Ag 3 In 97 Te 147 (I), In 2 Te 5 –Te–Ag 3 In 97 Te 147 (II), Ag 3 In 97 Te 147 –Te–AgIn 5 Te 8 (III), AgIn 5 Te 8 –Te–AgIn 3 Te 5 (IV), and AgIn 3 Te 5 –Te–AgInTe 2 (V), into separate phase regions at T ≤ 500 K. The formation of a thermodynamically stable combination of the binary and ternary phases in the (I)–(V) phase regions from a metastable phase mixture of substances was carried out at T ≤ 500 K in the R(Ag + ) part of the positive electrode (PE) of the galvanic cells (GCs) of the structure: (−) C |∙| Ag |∙| SE |∙| R(Ag + ) |∙| PE |∙| C (+), where C is the graphite (inert electrode), SE is the solid-state electrolyte (Ag 3 GeS 3 Br glass), and Ag is the left (negative) electrode. The Ag + ions in the R(Ag + ) region functioned as small nucleation centers for the formation of the stable phases. The spatial position of the (I)–(V) phase regions in the concentration space of the Ag–In–Te system relative to the position of silver was used to express the overall potential-forming reactions with the participation of the substances Ag, Te, In 2 Te 5 , Ag 3 In 97 Te 147 , AgIn 5 Te 8 , AgIn 3 Te 5 , and AgInTe 2 . The subsequent EMF measurements were carried out by applying the same GCs. The temperature dependences of the EMF of GCs with PE of the (I)–(V) phase regions were here used to determine, for the first time, the values of standard thermodynamic functions of the binary and ternary compounds. The determined values of the Gibbs energies of the formation of compounds are equal: G In 2 Te 5 ○ = ( 182.7 ± 1.9 ) kJ · mol − 1 , G AgInTe 2 ○ = ( 115.0 ± 3.1 ) kJ · mol − 1 , G AgIn 3 Te 5 ○ = ( 301.5 ± 6.5 ) kJ · mol − 1 , G AgIn 5 Te 8 ○ = ( 487.6 ± 11.3 ) kJ · mol − 1 , and G Ag 3 In 97 Te 147 ○ = ( 8594 ± 189 ) kJ · mol − 1 The correctness of the division of the equilibrium phase space of the Ag–In–Te system in the part AgInTe 2 –Te–In 2 Te 3 involving the AgInTe 2 , AgIn 3 Te 5 , AgIn 5 Te 8 , and Ag 3 In 97 Te 147 compounds was confirmed by the agreement of the calculated and literature-based thermodynamic data for In 2 Te 5 compound. Compositions of pairs of the ternary compounds for their subsequent practical application were proposed.

Keywords: phase equilibria; thermodynamic properties; EMF method; Gibbs free energy; Ag-based compounds; thermoelectric materials (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/21/8180/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/21/8180/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:21:p:8180-:d:961153

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().