Thermodynamic Properties of Eu–In Alloys

Abstract

The mixing enthalpies of liquid binary Eu–In alloys (0 < x< 0.66, 0.78 < x< 1) are determined by isoperibol calorimetry at 1170–1300 K. The thermodynamic properties of the liquid Eu–In alloys are described in the entire composition range using the model of ideal associated solution. The thermodynamic activities of components in the Eu–In melts demonstrate negative deviations from the ideal behavior, and the mixing enthalpies are characterized by significant exothermic effects. The minimum value of the mixing enthalpy is −35.1 ± 0.5 kJ/mol at x= 0.52 (T = 1300 K) and −41.2 ± ± 0.5 kJ/mol at x= 0.50 (T = 1170 K).