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The kinetics of nucleation of a core-shell composite nucleus that consists ofa core of stable final phase surrounded by a wetting layer of intermediatemetastable phase is studied using the kinetic theory of binary nucleation notonly in the size and composition space but also in the component space. Thesteady-state solution of the Fokker-Planck equation is considered. Variousformulas for the critical nucleus at the saddle point as well as for thepost-critical nucleus are derived. The kinetics of nucleation at the saddlepoint is more appropriately characterized in the size and composition space,while the kinetics of the post-critical nucleus is more appropriately describedin the component space. Although both the free-energy landscape and thereaction rates play decisive role to determine the kinetics of nucleation atthe saddle point, the details of the free energy landscape are irrelevant tothe kinetics of the post critical nucleus.

Nucleation pathway of core-shell composite nucleus in size and composition space and in component space