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Moving Steps and Crystal Defects on Spinel Surfaces

Published online by Cambridge University Press:  14 March 2011

S.V. Yanina  and
C.B. Carter
S.V. Yanina
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
C.B. Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
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Abstract

The morphology of the reconstructed {001} surface of MgAl2O4 spinel is studied by scanning probe microscopy (SPM). The observations show that the {001} surface of MgAl2O4 may exist as two variants which are related through 90° rotation about the [001] axis. These surface variants exhibit different lateral forces and tend to grow/evaporate and to etch anisotropically along either the [110] or the [110] directions of the crystal. Surface terraces that are formed by different variants were found to be separated by ∼2.0 Å-high steps, while the terraces which belong to the same variant are separated by ∼4.0 Å-high steps. It is expected that the origins of the preferential motion of ledges on the {001} spinel surface is related to the anisotropic distribution of cations along either the [110] or the [110] directions within the {001} crystal planes in the spinel crystal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 620: Symposium M – Morphology & Dynamics of Crystal Surfaces in Complex… , 2000 , M9.4.1
Copyright
Copyright © Materials Research Society 2000

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References

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