| Abstrakt: |
Abstract—Experimental data on the thermal conductivity of molten CeCl3–MCl salt mixtures, where M = Li, Na, K, and Cs, are presented. The concentration of cerium trichloride varies from 0.25 to 0.75 mol % at a step of 0.25 mol %. The initial salts of alkali metal chlorides are certified by DSC. The obtained melting temperatures are in good agreement with the literature data. Anhydrous cerium trichloride was synthesized from cerium(IV) oxide in two stages: the preparation of crystalline cerium hydrate and the removal of water of crystallization. Measurements are carried out by a stationary coaxial cylinder method in a nickel device in a temperature range individually selected for each composition. The relative measurement error does not exceed 5%. The convective and radiative contributions to heat transfer are estimated. The product of the Prandtl and Grashof numbers is less than 1000, which confirms the absence of convection. The calculated radiative contribution to heat transfer is no higher than 2.4%. The thermal conductivities of all melts under study increase with temperature. Concentration dependences are derived for molten mixtures of cerium and alkali metal chlorides. The thermal conductivity decreases when passing from Li to Cs, which is due to an increase in the radius of the alkali metal cation and, as a consequence, an increase in the interionic distance. [ABSTRACT FROM AUTHOR] |
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