M. I. Ivanov

Thermodynamic properties of alloys of the Ni-Sc and Ni-Y systems

Partial and integral enthalpies of mixing for Ni-Y melts at 1775 K (0 < xY < 0.34), 1850 K (0.72 < xY < 1) and Ni-Sc at 1880 K (0 < xSc < 0.35, 0.51 < xSc < 1) are determined by means of calorimetry. Thermodynamic properties of liquid and solid alloys and phase diagrams of Ni-Sc(Y) systems in wide ranges of concentration and temperature are modeled using the ideal associated solution theory. It is found that the activities of components exhibit strong negative deviations from the Raoult’s law.

Thermodynamic properties of liquid alloys Ni-Eu and Ni-Yb

Mixing enthalpies of melts of the binary Ni-Eu (0 < xNi < 0.89) and Ni-Yb (0 < xNi < 1) systems at 1300–1750 K were investigated using the isoperibolic calorimetry. They have alternating signs depending on the melt concentration. With the combined analysis of the data determined by us and in literature, the models of the liquid and solid alloys were obtained, and the phase diagrams were calculated.

Thermodynamic properties of Eu-Pd melts

Partial and integral enthalpies of mixing of melts of the Eu-Pd system were determined by calorimetry at 1300 K in the concentration interval of 0 < xPd < 0.37. It was established that the first partial enthalpy of mixing of Pd was −158 ± 2 kJ/mol. The thermodynamic properties of Eu-Pd melts were simulated according to the theory of ideal associated solutions over a wide interval of concentrations and temperatures. It was shown that the activities of components display strong negative deviations from Raoult’s law, and the minima of the integral Gibbs energies and enthalpies of mixing were found at xPd = 0.65.

THERMODYNAMIC PROPERTIES OF Al-Sc ALLOYS

The mixing enthalpies of liquid Al–Sc binary alloys (0.62 < xSc < 1) are determined by isoperibolic calorimetry at 1840 K. The thermodynamic properties of liquid Al–Sc alloys are described in the entire composition range using the ideal associated solution model. The thermodynamic activities of components in the Al–Sc melts demonstrate large negative deviations from the ideal behavior; the mixing enthalpies are characterized by significant exothermic effects. The minimum mixing enthalpy equals –32.7 ± 2.2 kJ/mol at xSc = 0.49. The experimental and literature data are compared.

Thermodynamic properties of alloys of the binary Sb–Yb system

AbstractMixing enthalpies of melts of the binary Sb–Yb system have been determined for the first time in the ranges 0 < xYb < 0.155 at 960–1030 K and 0.89 < xYb < 1 at 1140 K. It has been found that the melts form with great exothermic effects, and the partial enthalpies of the components at infinite dilution are:

Thermodynamic Properties of Binary Al–Ce and Ce–Fe Alloys

\Delta \bar H_{Sb}^\infty

Thermodynamic properties of melts of Mn-Sc(Y, Ln) systems

ΔH¯Sb∞ =–260,