where a is a dimensionless factor that is evaluated from the compositions at the particle/matrix interface and the average composition and D will be controlled by the slowest diffusing solute in a multicomponent alloy.[26] However, at high nucleation densities the isolation can be lost as the diffusion fields from neighboring nanocrystals begin to overlap (i.e., soft impinge-ment).[25] Under this condition there is a kinetic inhibition to further growth. Concurrent with the growth of nanocrystals, the highly refined sizes indicate that capillarity effects such as Ostwald ripening due to curvature-driven transport (i.e., Gibbs-Thomson effect) can be important.[25,27]

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