Methods for calculating specifi c electrical conductivity of the LiF+NaF mixtures melt
2024
Lavrenteva, Olga V. | Garkushin, Ivan K. | Nikitina, Alina S.
The calculation of the specifi c electrical conductivity of lithium and sodium fl uorides mixtures melts is presented. The Iinterest in the LiF–NaF system melts is determined by their practical signifi cance. Melts of LiF+NaF mixtures are used in heat-storing compositions and in metallurgy. They are part of various multicomponent systems. The specifi c electrical conductivity calculation by isoconcentration, isothermal and interpolation methods is given for LiF+NaF mixtures melts of various compositions using known reference data for the temperature range 1020...1340 K. A calculation has been performed for the eutectic composition. The resulting analytical equations have been used to describe and calculate the specifi c electrical conductivity of the eutectic mixture for temperatures 5°, 10°, 50°, 75°, 100° above the liquidus. The specifi c electrical conductivity of the eutectic mixture melt is calculated on isotherms by interpolation for the isoconcentration dependences of hypoeutectic and hypereutectic mixtures. Isotherms of electrical conductivity (1020...1340 K) of melts depending on the content of LiF and NaF components are described by a third-degree polynomial. Depending on the temperature, the coeffi cients in the resulting equation change linearly. A comparison has been made of the values of specifi c electrical conductivity ϰ(LiF+NaF), calculated from the obtained equations. The description of ϰ(LiF+NaF) by isoconcentration and isothermal methods has showed satisfactory convergence of calculation results and makes it possible to calculate the specifi c electrical conductivity of LiF+NaF mixtures melts of any given composition, including eutectic.
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