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Proceedings Paper

Modification of BCF theory due to step motion
Author(s): Konstantin Mazuruk; Narayanan Ramachandran; Ching-Hua Su
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Paper Abstract

Crystal growth kinetics from the vapor phase or from solution can be described by the diffusion of growth species to the echelon of equidistant steps present at vicinal surfaces. Diffusion takes place in a thin boundary layer adjacent to the interface. Present theories of this process neglect a convective transport mechanism in the boundary layer. In this work, we reexamine this zero-flow assumption. We consider the difference in the densities between the mother phase and the growing crystalline phase as the driving force for the flow. This force is localized at the step positions when only lateral growth of the steps is permitted. In such a case a highly nonuniform flow pattern is obtained. It consists of two vortices with the line between these vortices corresponding to a flow directed towards the step. This nonuniform part of the flow is found to extend into the mother phase up to an inter- step distance. This is the region where diffusion in the horizontal direction takes place. Consequently, the results suggest the importance of convective transport in the boundary layer. Finally, a constant horizontal flow, far from the surface, is predicted.

Paper Details

Date Published: 7 July 1997
PDF: 6 pages
Proc. SPIE 3123, Materials Research in Low Gravity, (7 July 1997); doi: 10.1117/12.277722
Show Author Affiliations
Konstantin Mazuruk, Universities' Space Research Association/NASA Marshall Space Flight Ctr. (United States)
Narayanan Ramachandran, Universities' Space Research Association/NASA Marshall Space Flight Ctr. (United States)
Ching-Hua Su, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 3123:
Materials Research in Low Gravity
Narayanan Ramachandran, Editor(s)

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