Structural and morphological features of crystallization reactions of amorphous films according to the electron microscopy data

Abstract

The possibility of classifying the crystallization reactions of amorphous films according to a number of structural and morphological features was revealed by electron-microscopic investigation "in situ". Layered polymorphic crystallization, islands polymorphic crystallization, dendrite polymorphic crystallization and fluid-phase crystallization were distinguished. The first three types of crystallization reactions occur without changes in chemical composition corresponding to amorphous film. In the case of fluid-phase crystallization the separation of the medium to crystalline and gas phases takes place. It is noted, that the layered polymorphic crystallization can be regarded as a "coherent" crystallization occurring in the accordance to the optical Huygens principle.