Abstract
The non-ideal activity of FeO(1) in iron silicate and iron oxide melts is described by treating the liquid as ideal and as consisting of a few complexes. The calculations show that the melt in the system Fe-O-SiO 2 can be described by considering the formation of the complexes Fe 3Si 2O 7 and Fe 3Si 6O 15 in addition to the components FeO, FeO 1.5 and Fe 2SiO 4. Using this model for the liquid phase, phase equilibrium relations including partial pressures of oxygen and activities of FeO(1) have been calculated in the system Fe-O-SiO 2. The calculated results are consistent with available experimental and theoretical data.
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