Phase stability analysis in binary systems

Stability analysis should be a standard practice far testing the physical v alidity of phase equilibrium states predicted by thermodynamic models howev er, it is seldom used in routine work of experimental data modeling. Lack o f stability analysis may result in potential modeling pitfalls or in an ina dequate prediction of data. In this contribution the concept of stability i s reviewed from a general viewpoint, showing how it applies to completely g eneral cases of binary phase equilibrium, from low to high-pressure ranges. Graphical examples are given using excess Gibbs energy models and equation s off state.