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Phase Diagrams
The Gibbs Phase Rule

· Two phases, phase i and phase k, are illustrated. Each phase contains a number of different atom types, i, j, .....
· Let: * Nij = Number of moles of j-atoms in phase i.
* Nkj= Number of moles of j-atoms in phase k.

* Gi , Gk are the Gibbs functions of the phases i and k respectively.
· Consider a process which transfers j-atoms from phase i to phase k. In this process: - ΔNij = +ΔNkj as the total number of atoms in the system are conserved.