Additive Ternary Molten Salt Systems—Calculation of Phase Diagrams from Thermodynamic Data of Lower Order Systems

Abstract

Calculations of the liquidus temperatures of additive ternary molten salt systems are carried out from the conformal ionic solution theory (up to second order terms). The comparison between measured and calculated phase diagrams is made for five systems chosen according to different types of liquidus and different values of the binary interaction coefficients. For most cases, and in particular when solid solutions are not reported, the agreement between measurements and calculations is found to be very good. In the search for low melting electrolytes for electrochemical applications, these equations should prove useful in predicting the range of compositions where low liquidus temperatures are most likely.