Editor’s column

A.S. Antonov, O.V. Mikhailova, E.A. Voronova, N.Yu.. Sdobnyakov

Abstract: In this paper the technique of preparation of samples for the study of fractal dimension and obtaining the current-voltage characteristics using a scanning tunneling microscope has been demonstrated.
Keywords: sample preparation, scanning tunneling microscopy (STM), fractal dimension, current- voltage characteristics

V.D. Aleksandrov, O.A. Pokyntelytsia

Abstract: A sharp change in naphthalene, diphenyl, and dibenzyl crystallization behavior from the equilibrium without overcooling to the nonequilibrium-explosive with overheating was determined bythermoanalysis. The  crystallization behavior depends on liquid phase overheating relative to the melting temperature. An average amount of the overheating that practically does not depend both on further overheating and number of heating – cooling cycles were calculated. A range of kinetic and thermodynamic parameters of crystallization was calculated using thermograms. By X-ray diffraction and optical microscopy changes in crystal structure were detected depending on the type of crystallization.
Keywords: naphthalene, diphenyl, dibenzyl, thermal analysis, melt overheat, subcooling, equilibrium and nonequilibrium crystallization, crystal structure, crystallization parameters