ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

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Burchakov A. V., Emelyanova U. A., Garkushin I. K., Дворянова Е. М., Финогенов А. А. Phase complex modeling and experimental identification of the compositions of low-melting electrolyte mixtures in the stable triangle LiF-NaF-KCl of the quaternary reciprocal system Li+ ,Na+ ,K+ ||F− ,Cl−. Electrochemical Energetics, 2024, vol. 24, iss. 2, pp. 103-112. DOI: 10.18500/1608-4039-2024-24-2-103-112, EDN: AICCCQ

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Language: 
Russian
Heading: 
Electrolytes for sources of electrochemical power
Article type: 
Article
UDC: 
544.1+544.015.3+544.018.4
DOI: 
10.18500/1608-4039-2024-24-2-103-112
EDN: 
AICCCQ

Phase complex modeling and experimental identification of the compositions of low-melting electrolyte mixtures in the stable triangle LiF-NaF-KCl of the quaternary reciprocal system Li+ ,Na+ ,K+ ||F− ,Cl−

Autors: 
Burchakov Alexander Vladimirovich, Samara State Technical University
Emelyanova Uliana Alexandrovna, Samara State Technical University
Garkushin Ivan Kirillovich, Samara State Technical University
Дворянова Екатерина Михайловна, Samara State Technical University
Финогенов Антон Александрович , Samara State Technical University
Abstract: 

Alkali metal halides are used as heat-storing materials, electrolytes for chemical power sources and solvents for inorganic substances. Using three-dimensional vector graphics software, a 3D model of the phase equilibrium states of the quasi-ternary system LiF-NaF-KCl, which is a stable triangle of the four-component reciprocal system Li+ ,Na+ ,K+ ||F-,Cl, was constructed. Based on the 3D model, the polythermal and isothermal sections and the polytherm of crystallization of the phases were constructed for the first time. The stable nature of the LiF-NaF-KCl triangle is confirmed by thermodynamic calculations for several temperatures of interaction of mixtures of the substances being a part of the unstable LiCl-NaF-KF triangle. The crystallization polytherm allows us to select mixture compositions in the temperature range from 590 to 650 and from 590 to 700°C for practical use as molten electrolytes for mid-temperature chemical current sources.

Key words: 
fusibility electrolyte
alkali metal halides
3D model
phase complex
quasi-ternary system
polythermal section
isothermal section
phase crystallization polytherm
Acknowledgments: 
The work was supported by the Ministry of Science and Higher Education of the Russian Federation (theme No. FSSE-2023-0003) as part of the state task of the Samara State Technical University
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Received: 
10.04.2024
Accepted: 
10.06.2024
Published: 
28.06.2024