On the meaning of the impingement parameter in kinetic equations of diffusion controlled reactions.
Journal of Materials Science, 36, (18), . (doi:10.1023/A:1017974517877).
If certain preconditions are met, the Johnson-Mehl-Avrami-Kolmogorov (JMAK) kinetic equation is exactly accurate for nucleation and growth reactions with linear growth and is, at least, a good approximation for nucleation and growth reactions with parabolic growth. These preconditions include randomly distributed product phases, isotropic growth and constant equilibrium state. Mechanisms causing deviations from these preconditions include: capillarity effect, vacancy annihilation, blocking due to anisotropic growth. It is shown that deviations lead to a modification of the overall transformation, which can be approximated well by a single equation. ...... The factors which influence the impingement parameter are discussed.
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