On the description of the liquidus line of systems presenting peritectic reactions

An approach for the modeling of solid–liquid equilibrium for systems with immiscible solid phases and peritectic reactions is presented in this communication. The method is based on the fact that the liquidus line of solid–liquid equilibrium diagrams correspond to the onset of the solid phase formation, and can thus be calculated through a stability analysis. The method was applied to different systems containing inorganic or organic compounds, yielding results that are similar to those obtained by assigning ad hoc models for activity coefficients of compounds in solid phase.

► A new approach for describing solid–liquid equilibrium temperature is presented.
► The approach is suitable for systems wherein a solid-phase complex is formed.
► The complex is taken into account through a solid-phase chemical reaction.
► Results are similar to those obtained using ad hoc models for solid phase activity.
► The developed method is easier to implement.