Miscibility gap


A miscibility gap is a region in a phase diagram for a mixture of components where the mixture exists as two or more phases – any region of composition of mixtures where the constituents are not completely miscible.
The IUPAC Gold Book defines miscibility gap as "Area within the coexistence curve of an isobaric phase diagram or an isothermal phase diagram."
A miscibility gap between isostructural phases may be described as the solvus, a term also used to describe the boundary on a phase diagram between a miscibility gap and other phases.
Thermodynamically, miscibility gaps indicate a maximum in the composition range.

Named miscibility gaps

A number of miscibility gaps in phase systems are named, including