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Determination Of The α-Al2O3(0001) Surface Relaxation and Termination by Measurements of Crystal Truncation Rods

Published online by Cambridge University Press:  15 February 2011

P. Guenard ,
G. Renaud ,
A. Barbier  and
M. Gautier-Soyer
P. Guenard
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, SP2M 17, rue des Martyrs, 38054 Grenoble Cedex 9, France
G. Renaud
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, SP2M 17, rue des Martyrs, 38054 Grenoble Cedex 9, France
A. Barbier
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, SP2M 17, rue des Martyrs, 38054 Grenoble Cedex 9, France
M. Gautier-Soyer
Affiliation:
CEA/Saclay, Département de Recherche sur l'Etat Condensé, les Atomes et Molécules, SRSIM, 91191 Gif-sur-Yvette, France
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Abstract

We have investigated the unreconstructed (0001) surface structure of sapphire (α-Al2O3) by Grazing Incidence X-ray Scattering. Modulations along the crystal truncation rods were analyzed in order to determine the chemical nature of the terminating plane, and the structural relaxations of the first few atomic planes below the surface. The most likely model yields a single Al layer termination with relaxations of the first four planes of -51%, +16%, -29% and +20% respectively. These results compare well with the most recent theoretical calculations on this surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 437: Symposium DD – Applications of Synchrotron Radiation to III , 1996 , 15
Copyright
Copyright © Materials Research Society 1996

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