Internal Cation Mobilities in the Molten Ternary System(Li,Na,K)Cl of the Eutectic Composition

Abstract

For molten (Li, Na, K)Cl of the eutectic composition (53.5-8.6-37.9 mol%), in the temperature range from 773 K to 973 K the relative differences in the internal cation mobilities have been measured by the Klemm method, and the conductivity by a direct current method. From these data and the molar volumes, evaluated from those of the pure salts on the assumption of additivity, internal mobilities of the cations, bLi, bNa and bK, have been calculated. Below ca. 873 Kt bLi < bK < bNa, and above bu bLi < bNa < bK. These orders are interpreted in terms of the potential profiles for cations located between two Cl- ions. bLi and bK in the present ternary system can be fairly well expressed by function of the number density of Cl- ions presented previously for the binary system (Li, K)Cl.