Abstract
Phase equilibrium data at liquidus temperatures are presented for mixtures in the system FeO–Fe2O3–Al2O3–SiO2. The volume located between the 1 and 0.2 atm. O2 isobaric surfaces of the tetrahedron representing this system was studied in detail. Scattered data were obtained at lower O2 pressures. Results obtained in the present investigation were combined with data in the literature to construct a phase equilibrium diagram, at liquidus temperatures, for the entire system FeO–Fe2O3–Al2O3–SiO2. Methods for interpretation of the diagram are explained.