The rubidium chloride – sodium chloride phase diagram

The phase diagram of the RbCl–NaCl system has been measured by the method of cooling curves. By combining these data with available thermochemical data for the system, the integral molar excess free energy of mixing at 800 °C has been calculated as ΔG E = −632X RbCl X NaCl cal/mole; and the integral molar excess entropy of mixing has been calculated as ΔS E = −0.208X RbCl X NaCl cal/°K mole. Estimated precisions are ±50 cal for ΔG E and ±0.05 cal/°K mole for ΔS E at X RbCl = X NaCl = 0.5.