Kinetics of phase transformations with heterogeneous correlated-nucleation

TL;DR

This paper introduces a stochastic model for 3D phase transformation kinetics considering correlated nucleation at surfaces, improving understanding of electrochemical deposition processes with significant nucleation correlations.

Contribution

It develops a correlation-based kinetic model that surpasses Poisson-based models, accurately describing phase transformation dynamics with correlated nucleation.

Findings

Second-order correlation series approximation is highly accurate.

Model effectively describes surface coverage and phase growth over time.

Application to electrochemical deposition highlights the importance of nucleation correlations.

Abstract

We develop a stochastic approach for describing 3D-phase transformations ruled by time-dependent correlated nucleation at solid surfaces. The kinetics is expressed as a series of correlation functions and, at odds with modeling based on Poisson statistics, it is formulated in terms of actual nucleation rate. It is shown that truncation of the series up to second order terms in correlation functions provides a very good approximation of the kinetics. The time evolution of both total amount of growing phase and surface coverage by the new phase have been determined. The theory is applied to describe progressive nucleation with parabolic growth under time dependent hard-disk correlation. This approach is particularly suitable for describing electrochemical deposition by nucleation and growth where correlation effects are significant. In this ambit the effect of correlated nucleation on the behavior of kinetic quantities used to study electrodeposition has also been investigated.