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In-Situ Observations of High Temperature Surface Processes on α-Alumina Bulk Crystals

Published online by Cambridge University Press:  22 February 2011

Z. L. Wang
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996-2200.
J. Bentley
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6376
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Abstract

Reflection electron microscopy (REM) was applied to image in-situ the dynamic changes of atomic-height steps on the surfaces of a-alumina bulk crystals heated to high temperatures. Atomic diffusion, desorption and adsorption processes on cleaved a-alumina (012) surfaces were directly observed at temperatures of 1470 to 1670 K. The surface started to show visible structural changes at 1470–1520 K. The main surface process appears to be atomic desorption, which creates large, flat vacancy-type terraces on the surface.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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References

1. Yagi, K., J. Appl. Cryst. 20, 147 (1987).CrossRefGoogle Scholar
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