Al2O3α Surface Structure Characterization by RHEED

M. Gillet and J. C. Bruna
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M. Gillet: Laboratoire SERMEC, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille cedex 20, France
J. C. Bruna: Laboratoire SERMEC, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille cedex 20, France

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 325-329

Abstract: The morphology of αAl2O3surfaces annealed in vacuum has been investigated by reflection high energy electron diffraction (RHEED). We have studied two kinds of faces: (0001) and$(\bar{1}012)$. The two faces behave differently. At high temperature the (0001) surface is unstable with only small facets and give evidence for variations of stoichiometry and structure with formation of an Al layer. The$(\bar{1}012)$surfaces give large facets and the diffraction patterns are consistent with (2 × 1) surface structure.

Date: 1998
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DOI: 10.1142/S0218625X98000608

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