High-entropy melt of lithium, sodium, and potassium fluorides and chlorides as a possible coolant for molten-salt reactors

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Abstract

Suggestions are made for potentially promising solvent melts for molten salt reactors from a mixture of six lithium, sodium, and potassium fluoride and chloride salts having high entropy of mixing. These compositions, containing less lithium salts, should have higher thermodynamic stability than FLiNaK or FLiBe because of their high entropy. The chemical formula of the maximum high-entropy solution, Li1/6Na1/6K1/6F1/4Cl1/4, may result from mixing the variety of alkali halides like MX (M = Li, Na, K and X = F, Cl) taken in an equimolar ratio. Molecular dynamic estimations of the density, heat conductivity, and viscosity demonstrate reasonable values of these properties between those of the fluorides and chlorides.

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About the authors

D. O. Zakiryanov

Institute of High-Temperature Electrochemistry, Ural Branch, RAS

Author for correspondence.
Email: N.K.Tkachev@gmail.com
Russian Federation, Yekaterinburg

N. K. Tkachev

Institute of Metallurgy, Ural Branch, RAS

Email: N.K.Tkachev@gmail.com
Russian Federation, Yekaterinburg

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Supplementary files

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2. Fig. 1. Temperature dependences of viscosity of various fluoride and chloride melts.

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3. Fig. 2. Thermal conductivity coefficients of melts depending on temperature. The dotted line shows the linear approximation of the calculated data.

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