AVRAMI EXPONENTS VERSUS CRYSTALLIZATION MECHANISMS

The determination of Avrami exponents is a common tool to analyse the kinetics of a first order phase transition. The values of the Avrami exponents evaluated from the slope of log(-log(1-χ)) vs. log(t) are used to determine the mechanism driving the transformation. A general analysis of the calculation of Avrami exponents for the usual case of radius dependent growth and increasing or decreasing nucleation rates is performed from two points of view, namely the effect of the evaluation procedure itself and the effect of complex nucleation and growth protocols.