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On the Roughening of Ceramic Surfaces

Published online by Cambridge University Press:  21 February 2011

J. R. Heffelfinger ,
M. W. Bench  and
C. B. Carter
J. R. Heffelfinger
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. S. E., Minneapolis, MN 55455
M. W. Bench
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. S. E., Minneapolis, MN 55455
C. B. Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. S. E., Minneapolis, MN 55455
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Abstract

The faceting of single-crystal ceramic surfaces has been investigated by atomic force microscopy, scanning electron microscopy and transmission electron microscopy. Single-crystals of α-Al2O3 (alumina) with different nominal surface orientations were annealed and used as a model system to investigate the faceting of a polished ceramic surfaces. The {1010} orientation of α-alumina, which facets into a hill-and-valley morphology, provides a dramatic representation of the different stages by which a surface facets. This surface starts faceting with the growth of an individual facet. The growth of this facet creates local surface disturbances that promote the nucleation of adjacent facets; thus, domains of faceted surface form on the otherwise smooth surface. Through time, these domains coalesce and the facets coarsen into a hill-and-valley morphology. Surfaces which facet into a terrace-and-step structure, such as (0001) and {1120} surfaces of alumina, are characterized for their progression of surface faceting and are compared with the stages of faceting observed for the {1010} surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 399: Symposium D – Evolution of Epitaxial Structure and Morphology , 1995 , 263
Copyright
Copyright © Materials Research Society 1996

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References

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