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Phase equilibria in the TiO 2 –SiO 2  system have been studied experimentally using DTA and SEM/EDX. The thermodynamic parameters for the TiO 2 –SiO 2  system have been assessed considering new experimental data of the present work and from the literature. Moreover, the miscibility of the liquid in the Al 2 O 3 –TiO 2 –SiO 2  system has been studied at 2013 K in air and shrinkage of the miscibility gap at 3.8 mol% Al 2 O 3  has been demonstrated. The experimental data obtained in the present work and literature as well as the thermodynamic databases for the binary Al 2 O 3 –TiO 2 , TiO 2 –SiO 2 , and Al 2 O 3 –SiO 2  systems have been used to derive the thermodynamic description of the Al 2 O 3 –TiO 2 –SiO 2  system using the CALPHAD approach. Solid phases have been modeled using the compound energy formalism. The liquid phase has been described by the two-sublattice partially ionic liquid model. A set of self-consistent parameters have been proposed, which resulted in a reasonably good agreement between the calculated and experimental data on the phase equilibria, liquid immiscibility, and thermodynamic properties in the Al 2 O 3 –TiO 2 –SiO 2  system.

Liquid Immiscibility and Thermodynamic Assessment of the Al2O3–TiO2–SiO2 System