Collect. Czech. Chem. Commun. 1995, 60, 911-916

Modelling of Phase Diagram Boundaries at Equilibrium of Two Binary Regular Phases

Jan Vřešťála,b and Ivo Stloukala

a Institute of Theoretical and Physical Chemistry, Masaryk University, 611 37 Brno, Czech Republic
b Institute of Physics of Materials, Academy of Sciences of the Czech Republic, 616 62 Brno, Czech Republic


The conditions of occurrence of extremes on the solidus and liquidus curves in a binary isobaric phase diagram are specified. The solid and liquid phases are regarded as regular solutions in equilibrium. Two simplifying assumptions are made: (i) the Gibbs function of melting of the pure components is a linear function of temperature; (ii) the two phases in equilibrium are regular solutions with a temperature-dependent regular solution parameter. The conditions of occurrence of inflexion points on the solidus and/or liquidus curves are obtained by modelling.