Molar thermal conductivity of molten salts

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 center dot m(2) center dot mole(-1) center dot K-1 center dot 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.