Electron Microscope Investigation of Crystals Based on Bend-Contour Arrangement II. Bending Phenomena of the Crystal Growth in an Amorphous Film

Bend-contour patterns are used to investigate the structure features of crystals of hexagonal selenium and tellurium grown in thin amorphous condensates of Se, SeTe, CuTe. The results are compared with microinterferometry data. Two bend effects are revealed: a hitherto unknown continuous bending, progressing with crystal growth of the lattice about the c-axis (360° rotation over a distance of 3 to 8 μm) and buckling of a thin-film crystal as a whole. The buckling is explained with the help of the following model: the build-up of the crystal lattice is accompanied by the formation of an abnormally large number of vacancy growth defects conditioned by crystallization from the amorphous state. As the excess vacancies emerge at the surface there arise compressive stresses developed by the amorphous film.