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The thermochemical properties of binary Ba-In melts were studied using calorimetry at 1070-1320 K over a wide composition range. It is shown that these melts are characterized by significant exothermic heat effects of mixing. The ideal associated solution model was used to calculate the activities of components, Gibbs energies, and mixing entropies of the alloys and to construct the liquidus curve in the phase diagram. These parameters agree with the literature data. [ABSTRACT FROM AUTHOR]

The mixing enthalpies of the liquid Ce-In-Ni ternary alloys have been determined by isoperibol calorimetry along three sections: (CeIn)N (0 < x < 0.11), (InNi)Ce (0 < x < < 0.12), and (CeNi)In (0 < x < 0.03). The mixing enthalpies and activities of components in the Ce-In-Ni ternary alloys are calculated using various models, chosen by critical analysis. The data obtained previously for the binary subsystems are used for calculations, and new experimental data for the ternary systems are employed to verify the reliability of the models. The melts mix with release of significant amounts of heat, and the activities of their components are characterized by negative deviations from ideal solutions. [ABSTRACT FROM AUTHOR]

The mixing enthalpies of liquid Ce-Ni binary alloys (0 < x < 0.45 at 1430 K and 0.78 < x < 1 at 1820 K) are determined by isoperibol calorimetry. The thermodynamic properties of the liquid Ce-Ni binary alloys are calculated for the entire composition range using the model of ideal associated solutions. The thermodynamic activities of components show negative deviations from the ideal behavior. The mixing enthalpies are characterized by significant exothermic effects. The minimum mixing enthalpy of the melts is -34.8 ± 0.9 kJ/mol at x = 0.66 and 1820 K. [ABSTRACT FROM AUTHOR]

The mixing enthalpies of liquid binary In-Ni alloys (0.85 < x < 1) at 1800 K were determined by isoperibol calorimetry. The thermodynamic properties of the In-Ni alloys were calculated for the entire composition range using the model of ideal associated solutions. The thermodynamic activities of melt components show negative deviations from the ideal behavior. The mixing enthalpies are characterized by moderate exothermic effects. The minimum mixing enthalpy of the melts is -12.0 ± 0.1 kJ/mol at x = 0.59. [ABSTRACT FROM AUTHOR]

The mixing enthalpies of liquid binary Ce-In alloys (0 < x < 1) at 1500 K are determined by isoperibol calorimetry. The thermodynamic properties of the liquid Ce-In alloys are calculated for the entire composition range using the model of ideal associated solutions. The thermodynamic activities of melt components show negative deviations from the ideal behavior. The mixing enthalpies are characterized by significant exothermic effects. The minimum mixing enthalpies of the melts are -43.8 ± 0.2 kJ/mol at x = 0.57. [ABSTRACT FROM AUTHOR]

The partial and integral enthalpies of mixing of Eu-Pt melts were determined by calorimetry at 1300 K in the composition range 0 < x < 0.36. The first partial enthalpy of mixing of Pt was found to be −171 ± 2 kJ/mol. The thermodynamic properties of the Eu-Pt melts were modeled in terms of ideal associated solution theory in wide composition and temperature ranges. The results indicate that the activities of the components have large negative deviations from Raoult's law and that the integral Gibbs energy and enthalpy of mixing have a minimum near x = 0.7. The enthalpy and excess Gibbs energy of mixing of Al-Eu-Pt ternary melts were modeled using our and others' data and Kohler's equation. [ABSTRACT FROM AUTHOR]