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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.

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A phenomenological analysis is carried out to investigate the propagation of sound wave in the positive column of a glow discharge plasma. Specifically, the effect of local energy transfer from the discharge into the gas is studied. The analysis shows that the density fluctuations cause variations in the energy transfer rate. This effect is found to be a function of the plasma parameters and acoustic wave frequency thus leading to acoustic dispersion. The conclusion confirms earlier mathematical treatment of the problem [Kolosov et al., AIAA Paper No. 99-4882, 1999] and provides a physical explanation of the phenomenon.

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