Solvus of KCl:Ca2+ solid solution by flotation measurements of density of single crystals

Abstract

Solvus of the system KCl:Ca2+ is plotted within the concentration range from 3 × 10−2 to 2.5 × 10−1 mol% at temperatures from 400 to 550 °C. The decomposition of the solid solution after different regimes of thermal treatment is fixed by a change in density with the aid of the flotation procedure. A thermodynamic analysis of the experimental data evaluates the dissol ution energy of the impurity, (1.37 ± 0.14) eV, and vibration entropy (ΔSv/k = 7.7 ± 2.3).