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Influences of thermal annealing and humidity exposure on surface structure of (100) single-crystal MgO substrate

Published online by Cambridge University Press:  31 January 2011

M. P. Delplancke-Ogletree ,
M. Ye ,
R. Winand ,
J. F. de Marneffe  and
R. Deltour
M. P. Delplancke-Ogletree*
Affiliation:
Department of Metallurgy and Electrochemistry, Faculty of Applied Sciences, CP165, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium
M. Ye
Affiliation:
Department of Metallurgy and Electrochemistry, Faculty of Applied Sciences, CP165, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium
R. Winand
Affiliation:
Department of Metallurgy and Electrochemistry, Faculty of Applied Sciences, CP165, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium
J. F. de Marneffe
Affiliation:
Laboratory of Solid State Physics, CP233, Faculty of Sciences, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium
R. Deltour
Affiliation:
Laboratory of Solid State Physics, CP233, Faculty of Sciences, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium
*
a)Address all correspondence to this author. e-mail: mpdelpla@ulb.ac.be
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Abstract

We studied the influence of thermal annealing on the surface structure of (100) singlecrystal MgO substrates by atomic force microscopy (AFM). By annealing MgO substrates at various temperatures for 4 h in flowing oxygen, we showed that the surface reconstruction could be explained by considering surface diffusion, surface evaporation, and condensation. At an annealing temperature of 1473 K, a stepped structure was formed with screw dislocations acting as step sources. The influence of humidity on the surface morphology of MgO substrates was also studied by exposing them to a constant humidity of 40 and 80% for different times. After an exposure time of 1.5 h in 80% humidity, the substrate surface was already covered by reaction products. For the 40% humidity, the corresponding time is 10 h. The major reaction product was identified as Mg(OH)2 by x-ray diffraction.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 2133 - 2137
Copyright
Copyright © Materials Research Society 1999

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References

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