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Growth Morphology of Vicinal Hillocks on the {101} Face of KH2PO4: Evidence of Surface Diffusion

Published online by Cambridge University Press:  21 February 2011

T. A. Land ,
J. J. De Yoreo ,
J. D. Lee  and
J. R. Ferguson
T. A. Land
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
J. J. De Yoreo
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
J. D. Lee
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
J. R. Ferguson
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

The growth morphologies of vicinal hillocks on KH2PO4 {101} surfaces have been investigated using atomic force microscopy. Both 2D and spiral dislocation growth hillocks are observed on the same crystal surface at supersaturations of ∼5 %. Growth occurs on monomolecular 5 Å steps both by step-flow and through layer-by-layer growth. The distribution of islands on the terraces demonstrate that surface diffusion is an important factor during growth. Terraces that are less than the diffusion length do not contain any islands. This, together with the length scale of the inter island spacing and the denuded zones provide an estimate of the diffusion length. In situ experiments at very low supersaturation (∼0.1 %) show that growth is a discontinuous process due to step pinning. In addition, in situ images allow for the direct determination of the fundamental growth parameters a, the step edge energy, and β, the kinetic coefficient.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 355: Symposium B1 – Evolution of Thin-Film and Surface Structure and Morphology , 1994 , 45
Copyright
Copyright © Materials Research Society 1995

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References

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