Thermodynamic Assessment of the Gallium‐Oxygen System

The experimental information relevant to the Ga‐O binary system has been critically assessed. A self‐consistent set of Gibbs energy functions describing the phases in this system and a phase diagram are presented for the first time. The adjustable parameters of the models are obtained by a least‐squares fit to the experimental data. The liquid phase is described by Hillert's partially ionic liquid model. The gallium oxides (α‐, β‐, γ‐, and δ‐Ga 2 O 3 ) are modeled as stoichiometric phases. The gas phase is treated as an ideal solution of the species Ga, Ga 2 , Ga 2 O, GaO, O, O 2 , and O 3 . The calculated phase diagram and thermodynamic properties agree very well with most of the experimental measurements.