Nucleation in between Dilute Solutions

according to Equation 4.71, nucleation becomes jxjssible at 

Nucleation in between Two Crowing Intermediate Phase Layers 

The phase 2 suppression criterion Equation 4.71 can then be easily reduced to the following form  

Note that Wi and W3 are of the order of unity. If phases 1 and 3 are mutually symmetrical (Agio = Ag3o, Wi = W3), then the criterion Equation 4.81 is reduced to 

Nudeation in between a Crowing Intermediate Phase and a Dilute Solution 

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