Abstract
Chromium oxide (Cr2O3) solubility was measured in soda lime borosilicate glass from 1400 to 1500 K. The temperature dependence of the solubility increased with increased sodium oxide concentration. The enthalpies of solution for the equilibrium phases were calculated from the solubility data in the temperature range from 1400 to 1500 K. The enthalpy of fusion for Cr2O3 at 1450 K was calculated to be 108.0 kJ·mol−1. This value was less than our measured values for enthalpy of solution, 111.0 ± 0.5 and 158.4 ± 0.3 kJ·mol−1, indicating that all enthalpies of mixing were positive; that is, the mixing process was endothermic. This characterized the interaction between solute and solvent as repulsive.
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