Growth of crystals in presence of impurities. A hypothesis based on a kinetic approach

摘要

A hypothesis is proposed concerning the growth of crystals in the presence of impurities soluble in the parent phase but insoluble in the crystal. The hypothesis is based on: (i) a kinetic model developed by Bliznakov, where it is assumed that the impurity layers exert a passive resistance towards the growth of crystals, (ii) results obtained by Kaischew concerning the nucleation of crystals on. foreign substrate; according to which the heterogeneous nucleation is more favourable than the homogeneous one, in the presence of the same supersaturation, and (iii) a statement of Distler and co-workers that a foreign intermediate layer contains "single crystal" structural information about the crystal face where the layer has been formed. [References: 9]