Before revision:  The third phase follow the Ostwald rule where in the course of time one phase transforms into another metastable phase with a similar free energy . Similar arrested growth processes were previously observed in oxygen interstitials diffusion in layered perovskites and in crystallization of proteins.
After revision:  The third phase follow the Ostwald rule where in the course of time one phase transforms into another metastable phase with a similar free energy as observed in oxygen interstitials diffusion in layered perovskites and in crystallization of proteins.