ABSTRACT The results of investigations of {100}, the nongrowing faces of sodium chlorate crystals... more ABSTRACT The results of investigations of {100}, the nongrowing faces of sodium chlorate crystals in supersaturated solutions, are presented. It occurred that some of the faces did not grow, whereas the neighbor faces of the same crystals grew. The dissolution and refaceting of the crystals did not affect the probability of the nongrowing face appearance and the reduction of the range of face growth rates. Nongrowing faces are very stable; they start to grow at a relatively high supersaturation, face by face or several faces simultaneously. The order of the start of the growth is random, subsequently grown neighbor or opposite faces. Possible reasons for coexistence of growing and nongrowing faces, Ostwald ripening, microscopic conditions in the crystallization cell, microstructure of crystal face, and the impurity effects are discussed.
ABSTRACT The interaction of a transversely excited atmospheric (TEA) CO2 laser with austenitic st... more ABSTRACT The interaction of a transversely excited atmospheric (TEA) CO2 laser with austenitic stainless AISI 316 and high-speed tool AISI M2 steel is considered. The results have shown that both types of steel were surface modified by the laser beam, for the laser energy densities used. Morphological features on the AISI M2 were more prominent in comparison to a AISI 316 steel. On the AISI M2 steel crater like forms, solidified boundary and hydrodynamical modifications were observed, while on the AISI 316 one, corrugation, cracking and resolidified areas were registered. The morphology changes of steel surfaces in dependence of laser pulse temporal shape were analyzed especially. The pulse with a tail for difference of a tail-free pulse, for the same incident peak power density, as a rule caused higher level of damage.
It has been shown that a strong correlation exists between the growth rate of large Rochelle salt... more It has been shown that a strong correlation exists between the growth rate of large Rochelle salt crystals and that of their seeds, although the crystal seed-crystal border has many defects. Large crystals grow at higher growth rates from seeds that grew at higher growth rates. Processes of partial dissolution and refaceting of the crystals did not essentially influence the growth rate of crystals. The connection between the growth rate dispersion of crystals and that of their seeds indicates that the mosaic structure of seeds is transmitted to crystals developed from them.
2006 25th International Conference on Microelectronics, 2006
ABSTRACT External magnetic field influence on silicon submicron surface periodic structures obtai... more ABSTRACT External magnetic field influence on silicon submicron surface periodic structures obtained by the action of nitrogen supersonic quasistationary compression plasma flow (CPF) is studied. CPF is generated by magnetoplasma compressor. It was found that, without external magnetic field, highly-oriented silicon periodic cylindrical shape structures are produced during single pulse surface treatment. Silicon periodic structures were modified by external constant magnetic field. Hexagonal structures of the side length about 500 nm and height of the order of 10 nm, are obtained. Morphology investigation was made by SEM and AFM microscopy
ABSTRACT The results of investigations of {100}, the nongrowing faces of sodium chlorate crystals... more ABSTRACT The results of investigations of {100}, the nongrowing faces of sodium chlorate crystals in supersaturated solutions, are presented. It occurred that some of the faces did not grow, whereas the neighbor faces of the same crystals grew. The dissolution and refaceting of the crystals did not affect the probability of the nongrowing face appearance and the reduction of the range of face growth rates. Nongrowing faces are very stable; they start to grow at a relatively high supersaturation, face by face or several faces simultaneously. The order of the start of the growth is random, subsequently grown neighbor or opposite faces. Possible reasons for coexistence of growing and nongrowing faces, Ostwald ripening, microscopic conditions in the crystallization cell, microstructure of crystal face, and the impurity effects are discussed.
ABSTRACT The interaction of a transversely excited atmospheric (TEA) CO2 laser with austenitic st... more ABSTRACT The interaction of a transversely excited atmospheric (TEA) CO2 laser with austenitic stainless AISI 316 and high-speed tool AISI M2 steel is considered. The results have shown that both types of steel were surface modified by the laser beam, for the laser energy densities used. Morphological features on the AISI M2 were more prominent in comparison to a AISI 316 steel. On the AISI M2 steel crater like forms, solidified boundary and hydrodynamical modifications were observed, while on the AISI 316 one, corrugation, cracking and resolidified areas were registered. The morphology changes of steel surfaces in dependence of laser pulse temporal shape were analyzed especially. The pulse with a tail for difference of a tail-free pulse, for the same incident peak power density, as a rule caused higher level of damage.
It has been shown that a strong correlation exists between the growth rate of large Rochelle salt... more It has been shown that a strong correlation exists between the growth rate of large Rochelle salt crystals and that of their seeds, although the crystal seed-crystal border has many defects. Large crystals grow at higher growth rates from seeds that grew at higher growth rates. Processes of partial dissolution and refaceting of the crystals did not essentially influence the growth rate of crystals. The connection between the growth rate dispersion of crystals and that of their seeds indicates that the mosaic structure of seeds is transmitted to crystals developed from them.
2006 25th International Conference on Microelectronics, 2006
ABSTRACT External magnetic field influence on silicon submicron surface periodic structures obtai... more ABSTRACT External magnetic field influence on silicon submicron surface periodic structures obtained by the action of nitrogen supersonic quasistationary compression plasma flow (CPF) is studied. CPF is generated by magnetoplasma compressor. It was found that, without external magnetic field, highly-oriented silicon periodic cylindrical shape structures are produced during single pulse surface treatment. Silicon periodic structures were modified by external constant magnetic field. Hexagonal structures of the side length about 500 nm and height of the order of 10 nm, are obtained. Morphology investigation was made by SEM and AFM microscopy
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Papers by Mico Mitrovic