Crystallization kinetics and rheology of undercooled melts

Abstract

It was found that the transport of molecules through the crystal/melt interface is controlled by self-diffusion into the crystal and not only by shear viscosity of the melt. This is done by comparing the temperature dependence of both the linear rate of crystallization and the shear viscosity of two substances (NaPO 3 and LiPO 3). A survey of the available literature data on crystallization and structural relaxation of other substances is also considered. A simple phenomenological approach is proposed, which describes quantitatively the crystallization kinetics by taking into account the fact that the activation energy for molecule transition through the interface depends on both the activation energy of shear viscosity and the activation energy of self-diffusion into the crystal.