Electrical Conductivity of Molten Li[sub 2]CO[sub 3]–X[sub 2]CO[sub 3] (X: Na, K, Rb, and Cs) and Na[sub 2]CO[sub 3]–Z[sub 2]CO[sub 3] (Z: K, Rb, and Cs)

Abstract

The electrical conductivities of the molten binary salt mixtures (X: Na, K, Rb, and Cs) and (Z: K, Rb, and Cs) were measured using an ac two-probe technique and electrochemical impedance spectroscopy. The electrical conductivities of the eutectic compositions of and at were 2.06 and , respectively. The conductivity of molten (X: Na, K, Rb, and Cs) and (Z: K, Rb, and Cs) decreases with an increase in the ionic radius of X or Z. We have succeeded in correlating the equivalent conductivity of a binary carbonate mixture Λ, with the composition ( and ), the equivalent conductivities of the pure components A and B ( and ), and two parameters ( and ) as . The pair of interaction parameters ( and ) can be estimated for a binary system of molten carbonates using the relationship between the cationic radii and the equivalent conductivities of the pure carbonates.