Thermodynamics of liquid In-Ga-Zn alloys determined by vapor pressure method

Abstract

Application of the Knudsen method for liquid In-Ga-Zn alloys in the range from 618 to 818 K provided experimental data which made it possible to characterize the thermodynamic properties of the liquid and gaseous phases of the In-Ga-Zn system. The examined alloys were selected along four cross sections for the mole fraction ratios xIn/xGa equal to 4/1, 3/2, 2/3, 1/4. For each of the cross sections, the value of the mole fraction of zinc in the tested alloys was approx.: 0.2, 0.4, 0.6 and 0.8. Based on the obtained experimental data, the values of the activity of zinc were calculated and then used in the optimization procedure, leading to the determination of parameters of the equations characterizing the Gibbs free energy of liquid In-Ga-Zn alloys as a function of temperature and composition. The Gibbs free energy of the ternary In-Ga-Zn liquid alloys was described with the application of the extrapolation method based on the binary systems as given by the Jacob-Fitzner-Muggianu approach.