THERMODYNAMICS OF ISOLATED MISCIBILITY GAPS

A one parameter, thermodynamic solution model that presumes significan t ternary interactions is given. The model predicts phase diagrams tha t contain isolated, multiphase miscibility gaps. A numerical example o f a ternary system shows that three-phase miscibility gaps form and th en combine as the temperature is lowered. The critical lines associate d with the gaps have three maxima, three minima and three tricritical points.