Calculation of the thermodynamic properties of the Ga-Sb-Tl liquid alloys

Abstract

The results of the calculation of the thermodynamic properties for liquid Ga-Sb-Tl alloys at the temperature 1073 K are presented in this paper. Initially, the most appropriate thermodynamic model for the investigated system was selected. Based on a comparison of the values calculated by different geometric models (Kohler, Muggianu, Toop, Hillert, Chou) with the existing experimental based data, asymmetric models of calculation were determined to give the best results. The asymmetric nature of the investigated ternary system was additionally confirmed by the Chou similarity coefficient concept. For these reasons, further complete thermodynamic calculations were performed according to the Hillert model in five sections of the ternary Ga-Sb-Tl system from each corner with the mole ratio of other two components being 9:1; 7:3; 5:5; 3:7 and 1:9. The obtained results include integral excess Gibbs energy dependences on composition for all the investigated sections. The calculated activity values at 1073 K for all components are given in the form of isoactivity diagrams. Comparison between the calculated and experimentally obtained gallium activities shows good agreement.

Formation enthalpies of Fe–Al–RE ternary alloys calculated with a geometric model and Miedema's theory

“…The methods to estimate the thermodynamic properties of ternary system by means of extrapolation from constitutive binary systems include symmetric and asymmetric ones [3][4][5][6][7][8][9][10]. The prediction methods of formation enthalpy for multicomponent system based on Miedema's theory were also proposed [11][12][13] since the formation enthalpies of most of binary systems can be calculated with Miedema's theory [14][15][16][17].…”

Enthalpies of formation for the Al–Cu–Ni–Zr quaternary alloys calculated via a combined approach of geometric model and Miedema theory

“…The methods to extrapolate thermodynamic properties of ternary systems from constitutive binary systems include symmetric and asymmetric methods [1][2][3][4][5][6][7][8]. The prediction methods of enthalpy of formation of multi-component systems based on Miedema's theory were also proposed [9][10][11][12] since the enthalpies of formation of most of binary systems can be calculated with Miedema's theory [13][14][15][16].…”

Experimental Determination fo Ga Activity in Liquid Ga-Sb-Tl Alloys by EMF Method

“…Integral excess Gibbs energies of mixing were derived according to Darken's method from the two binary data of Ga-Sb and Ga-Tl systems combined with the ternary data along pseudobinary system of (Sb y Tl 1-y )-Ga (** in the Table ) and also from the combination of the ternary data and basal binary data of Sb-Tl system (* in the Table ). Dragan et al [4] reported the thermodynamic properties in this system at 1073K obtained by use of several thermodynamic models [5] based on the constituent three binary data; Ga-Sb [1], Ga-Tl [2] and Sb-Tl [6]. One of the results is shown in Fig.…”