COMPUTER-SIMULATION OF CRYSTALLIZATION KINETICS WITH NON-POISSON DISTRIBUTED NUCLEI

The influence of non-uniform distribution of nuclei on the crystalliza tion kinetics of amorphous materials is investigated. This case cannot be described by the well known Johnson-Mehl-Avrami (JMA) equation, wh ich is only valid under the assumption of a spatially homogeneous nucl eation probability. The results of computer simulations of crystalliza tion kinetics with nuclei distributed according to a cluster and a har d-core distribution are compared with JMA kinetics. The effects of the different distributions on the so-called Avrami exponent n are shown. Furthermore, we calculate the small-angle scattering curves of the si mulated structures which can be used to distinguish experimentally bet ween the three nucleation models under consideration.