Thermodynamic Assessment of the Ternary Systems Ga—Mg—O, Ga—Ni—O, Mg—Ni—O and Extrapolation to the Ga—Mg—Ni—O Phase Diagram.

Abstract

Abstract The available literature information on the thermodynamic properties and phase equilibria for the ternary systems Ga–Mg–O, Ga–Ni–O, and Mg–Ni–O has been critically assessed. New experimental data have been obtained for the Ga–Mg–O system. Based on the known thermodynamics of the boundary systems Ga–O, Mg–O, and Ni–O models have been defined to describe the Gibbs energy of the individual phases. The model parameters have been optimized by least-squares fit to the selected experimental information of different kind (phase diagram data, calorimetric data, and equilibrium oxygen pressures). A self-consistent set of Gibbs energy functions describing the oxide part of the Ga–Mg–Ni–O system, which contains two solution phases of halite- and spinel-type has been obtained for the first time.