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Molar thermal conductivity of molten salts

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Abstract

Analysis of the available thermal conductivity data for the molten alkali and alkaline-earth salts, performed with the standard least square method and the interval analysis, reveals that the molar thermal conductivity of the molten alkali halides and alkali nitrates at temperatures close to their melting point has a constant value, equal to 19.08 and 23.42 W · m2 · mole−1 · K−1 · 10−6, respectively. The molar thermal conductivity of molten salts having bi-charged ions is twice higher than that of univalent salts. It means that the molar thermal conductivity depends on the charge of ions comprising salt. The molar (equivalent) thermal conductivity was found to be temperature independent. It allows evaluating the thermal conductivity of molten salt mixtures. The thermal conductivity for some molten mixtures (LiF-KF, CsCl-BaCl2, NaNO3-KNO3) was calculated considering the equivalent thermal conductivity as a constant.

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Acknowledgments

This work was supported by the Russian Foundation for Basic Research. Project 15-01-07-909 and the Russian Federation Government Act 211 on Contract № 02.A03.21.0006.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, St. Akademicheskaya 20, Yekaterinburg, 620137, Russian Federation

    A. Redkin, Yu. Zaikov & O. Tkacheva

  2. Institute of Mathematics and Mechanics, St. S. Kovalevskaya 16, Yekaterinburg, 620990, Russian Federation

    S. Kumkov

  3. Ural Federal University, St. Mira 19, Yekaterinburg, 620002, Russian Federation

    Yu. Zaikov & S. Kumkov

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  1. A. Redkin
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Correspondence to A. Redkin.

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Redkin, A., Zaikov, Y., Tkacheva, O. et al. Molar thermal conductivity of molten salts. Ionics 22, 143–149 (2016). https://doi.org/10.1007/s11581-015-1592-y

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