Topology of Liquidus Phase Diagrams of Charge‐Asymmetric Reciprocal Molten Salt Systems

Publisher Website
Google Scholar
Abstract
An empirical extension of conformal ionic solution theory is presented which describes the solution behavior of a class of reciprocal molten salt systems, the A+qA, B+qB∥C‐qC, D‐qD charge‐asymmetric systems. The thermodynamic properties of such ternary systems can be calculated from data on the standard free energy change for the metathetical reaction between the 4 pure constituents and solution data on the 4 binary subsystems. Calculated liquidus phase diagrams for the systems Na,Sr∥Cl,NO3; Na,Ba∥Cl,NO3; Li,K∥Cl,CrO4; Li,K∥Br,CrO4; and Na,Ca∥F,Cl agree well with measurements within experimental uncertainties. These systems are illustrative of a wide range of values of the thermodynamic quantities used in the calculations. The equations developed should prove useful as a test of the self‐consistency of reported phase diagrams, as a means of calculating Liquidus temperatures in experimentally inaccessible regions, and as an aid in constructing phase diagrams from a minimum number of measurements.