Testing Method for the Johnson–Mehl–Avrami Equation in Kinetic Analysis of Crystallization Processes

Abstract

The kinetics of crystallization processes in solids are usually described by the Johnson–Mehl–Avrami equation. One of the most popular methods to test the applicability of this equation is based on a double logarithmic plot of fraction crystallized (α). However, such plot is not very sensitive to small changes in α, and its reliability is rather limited. A simple and convenient testing method based on rate data (dα/dt) is proposed. The method can be applied to virtually any type of kinetic data obtained under isothermal or nonisothermal conditions.