Binary common-ion alkali halide mixtures thermodynamic analysis of solid-liquid phase diagrams: II. Systems with complete solid miscibility application of the liqfit method

Abstract

LIQFIT is an iterative procedure — with intermediate phase diagram calculations — in which the calculated liquidus is made to run through the experimental liquidus points. The computations yield a reliable solidus and in addition the Redlich-Kister coefficients of the ΔG E function. The latter is the difference between the excess Gibbs energies of the liquid and solid mixtures. The calculations are based on the equal-G curve (EGC), i.e. the projection on the TX plane of the intersection of the GTX surfaces of the liquid and solid mixtures. The EGC is the link between the phase diagram and the ΔG E function. Results are presented for 18 common-ion alkali halide systems which show complete miscibility in the solid state.