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A competitive adsorption model of steady-state growth of a crystal from a lightly-doped melt

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
24
Issue
11
Identifiers
DOI: 10.1016/0022-3697(63)90166-5

Abstract

Abstract A model of the solid-liquid interface region of diamond-type crystals is postulated, in which conventional adsorption theory is used to derive an expression for the solute distribution in the growing crystal. It is found that there is a large variation with surface orientation of times available for approach to adsorption equilibrium at growth sites. Thus, on close-packed {111} planes, the proportion of solute adsorbed is not able to depart far from its initial value, while on most other orientations it can approach or attain equilibrium. The theory accounts, qualitatively, for the facet distribution coefficients, their independence of solute concentration over a wide range, and for the distribution coefficient in equilibrium crystals being at the equilibrium level, despite the facets on such crystals.

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