The Molten Mixture FLiNaK–CeF₃: Dependence of Thermal Conductivity and Heat Capacity on Composition and Temperature

The thermal conductivity of FLiNaK + CeF₃ melts was measured by the stationary method of coaxial cylinders. Concentrations of CeF₃ were varied from 0 to 30 mol % with a step of 5 mol % in the temperature range from 500 to 800°C. The thermal conductivity increases with increasing temperature for all studied mixtures in a wide temperature range. Linear equations for the temperature dependences of thermal conductivity are obtained for each composition of the molten mixture FLiNaK + CeF₃. The increasing mole fraction of cerium fluoride leads to decrease of the thermal conductivity. The obtained liquidus temperatures are in good agreement with literature data. The specific isobaric heat capacity of the molten system FLiNaK + CeF₃ in the range of cerium trifluoride concentrations from 0 to 20 mol % has been measured for the first time.