Abstract
A fast computer model, intended for the calculation of the overall reaction rate (current) of anisotropic or nonhomotetic growth of a new-phase nuclei on the basis of the Voronoi diagram, is designed. The model is used for studying the kinetics of a heterogeneous reaction in the conditions where hemispherical nuclei of the new phase acquire a semiellipsoid shape in the course of an anisotropic growth. The calculation of current transients (potentiostatic i vs. t dependences) is substantially complicated in the initial stage of reaction, where the size of growing nuclei exceeds the critical value by less than an order of magnitude. If semiellipsoid nuclei overlap, the overall reaction rate is not determined by variations in the overall area of the reaction surface, as opposed to the growth of hemispherical nuclei. The kinetics of a nonhomotetic nuclei growth may be described by models designed for an isotropic growth of hemispherical nuclei.
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Guterman, V.E., Nadolin, K.A. Computer-aided Modeling of the Time Dependences of the Current during Anisotropic Growth of Product Nuclei. Russian Journal of Electrochemistry 37, 63–72 (2001). https://doi.org/10.1023/A:1009031829337
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DOI: https://doi.org/10.1023/A:1009031829337