Enthalpies of mixing in molten UCl3-NaCl system

Abstract

The present paper reports the experimental enthalpies of mixing in the UCl3-NaCl molten system previously unknown. The calorimetric experiments were performed as all of the simple liquid-liquid type under argon at atmospheric pressure, 1113 K. The mixing enthalpy values in UCl3-NaCl are much close to the results in NdCl3-NaCl than that in DyCl3-NaCl. We calculated the partial molar mixing enthalpies of NaCl and UC13 for the comparison with those in rare earth trichloride-NaCl systems. The partial enthalpies of mixing of UC13 decrease gradually with decreasing the concentration. This tendency is very close to those in NdCl3-NaCl. However, those in DyCl3-NaCl are almost stable around 0 on the concentration range xMC13 = 0.5 1 and rapidly decrease with decreasing concentration x MC13