THE THERMAL CONDUCTIVITY OF MOLTEN MIXTURES OF СeCl3–MCl (M = Li, Na, K, Cs) SYSTEMS

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The paper presents experimental data on the thermal conductivity of molten salt mixtures СeCl3–MCl, where M = Li, Na, K, Cs. The concentration of cerium trichloride varies from 0.25 to 0.75 mole percent in 0.25 increments. The initial salts of alkali metal chlorides were certified by DSC. The obtained values of melting temperatures are in good agreement with the literature data. Anhydrous cerium trichloride was obtained from cerium(IV) oxide in 2 stages: preparation of cerium crystalline hydrate and removal of water of crystallization. The measurements were carried out by the stationary method of coaxial cylinders in a nickel device in the temperature range individually selected for each composition. The relative measurement error does not exceed 5%. In this work, the convective and radiative contributions to heat transfer were estimated. The value of the product of Prandtl and Grashof numbers is less than 1000, which confirms the absence of convection. The calculated radiative contribution to heat transfer does not exceed 2.4%. The thermal conductivity of all investigated melts increases with increasing temperature. The concentration dependences of molten mixtures of cerium and alkali metal chlorides were obtained. The thermal conductivity decreases upon 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.

Sobre autores

K. Bobrova

Institute of High Temperature Electrochemistry of the UB RAS

Autor responsável pela correspondência
Email: ksuybobrova@gmail.com
Russia, Yekaterinburg

V. Dokytovich

Institute of High Temperature Electrochemistry of the UB RAS

Email: ksuybobrova@gmail.com
Russia, Yekaterinburg

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