Thermodynamic assessments of the Ag–Y and Sc–Y systems

Abstract

a b s t r a c tThe phase diagrams and thermodynamic properties in the Ag-Y and Sc-Y binary systems have been assessed by using the CALPHAD (Calculation of Phase Diagrams) method on the basis of the experimental data including the thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, bcc, fcc, and hcp phases were described by the subregular solution model with the Redlich-Kister equation, and those of the intermetallic compounds (Ag 51 Y 14 , Ag 2 Y and AgY phases) in these two binary systems were described by the sublattice model. The thermodynamic parameters of the Ag-Y and Sc-Y binary systems were obtained, and an agreement between the calculated results and experimental data was obtained in each binary system.

Thermodynamic assessments of the Ag–Tb and Ag–Ho systems

“…The calculated minimum values in the Ag-Tb and Ag-Ho systems are respectively −25.08 kJ/mol at 43 at.% Tb and −30.17 kJ/mol at 42.5 at.% Ho, which are close to the value (−29 kJ/mol) predicated by Boer and Perrifor [12]. It is seen that the minimum values of enthalpies of mixing of the liquid phase appear at about 40 at.% X in the Ag-X (X: Sc [22], Y [23], Ce [24], Nd [25], Gd [25] and Yb [26]) binary systems.…”

“…Calculated enthalpies of mixing of liquid phase with reference states of pure elements of Ag (liquid) and X (liquid)[22][23][24][25][26].…”

Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems

“…In order to design highperformance alloys with RE elements, it is important to develop a thermodynamic database including RE elements alloys. Currently, our group is focusing on the development of a thermodynamic database of RE alloy system, [4][5][6][7][8][9][10][11][12][13] which are important for the design of alloys with additions of RE elements. As a part of this thermodynamic database, this present work is to present the thermodynamic descriptions of the Bi-Tb and Bi-Y binary systems based on the available experimental data by means of the CALPHAD method.…”

Monte Carlo Calculations of Magnetic Heat Capacity of La0.7Sr0.3-x MnO3-d

“…Among the many devices and heterostructures that have been realized [15], La 0.7 Sr 0.3−x MnO 3−δ has been a spotlight of intense research because of its high Curie temperature T C and close lattice match with other perovskite compounds [16]. These fascinating electronic properties are consequence of the strong coupling between the spin, charge, orbital, and lattice degrees of freedom [17].…”