CLASSIFICATION OF EQUILIBRIUM DIAGRAMS

Equilibrium diagrams may be classified according to the relation of the components in the liquid  and solid states as follows:

1. Components completely soluble in the liquid state,

          (a) and also completely soluble in the solid state,

          (b) but partly soluble in the solid state (EUTECTIC REACTION)

          (c) but insoluble in the solid state (EUTECTIC REACTION)

          (d) The PERITECTIC Reaction

2. Components partially soluble in the liquid state,

          (a) but completely soluble in the solid state,

          (b) and but partly soluble in the solid state.

3. Components completely insoluble in the liquid state and completely insoluble in the solid state.