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We suggest a simple model to describe polyamorphism in single-componentfluids using a maximum-valence approach. The model contains three types ofinteractions: i) atoms attract each other by van der Waals forces that generatea liquid-gas transition at low pressures, ii) atoms may form covalent bondsthat induce association, and iii) bonded atoms attract or repel each otherstronger than non-bonded atoms, thus generating liquid-liquid separation. As anexample, we qualitatively compare this model with the behavior of liquid sulfurand show that condition (iii) generates a liquid-liquid phase transition inaddition to the liquid-gas phase transition.

Modeling Fluid Polyamorphism Through a Maximum-Valence Approach