Thermodynamic Properties of Eu- In Alloys

Abstract

Mixing enthalpies of the liquid binary Eu–In alloys (0 < x_In < 0.66; 0.78 < x_In < 1) are determined by isoperibolic calorimetry at 1170–1300 K. 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/mole at x_In = 0.52 (T = 1300 K) and –41.2 ± 0.5 kJ/mol at x_In = 0.50 (T = 1170 K).