An assessment of the Fe-S system using a two-sublattice model for the liquid phase

The strong variation in thermodynamic properties of the liquid phase in some systems is often accounted for by hypothesizing the existence of molecular-like aggregates. It is now suggested that it could also be accounted for in terms of a two-sublattice model. This model is applied to the Fe-S system. A good agreement is obtained with experimental information on the sulfur activity and phase equilibria. The assessment of the Fe-S system was carried out using a computer-operated optimization procedure and the phase equilibria were calculated with a rather general computer program. A. Fernandez Guillermet is, at present he is on leave for studies at the Dept. of Metallurgy, Royal Inst. of Technology, S-10044 Stockholm.