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Atomic Structure of The α-A12O3(0001)(√31×31)R±9° Reconstruction

Published online by Cambridge University Press:  15 February 2011

G. Renaud  and
B. Villette
G. Renaud
Affiliation:
CEA, Département de Recherche Fondamentale sur la Matière Condensée, SP2M/ PI, 85X, 38041 Grenoble Cédex, FRANCE
B. Villette
Affiliation:
Laboratoire pour l'tilisation du Rayonnement Electromagnétique (L.U.R.E.), Bât. 209D, 91405 Orsay Cédex, FRANCE.
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Abstract

The atomic structure of the α-A12O3 (0001)(√31×√31)R±9° reconstruction has been solved by Grazing Incidence X-ray Diffraction. The surface structure is found to be perfectly commensurable with the underlying bulk lattice, with exponential correlation length ∼500 Å. It consists of hexagonal zones of two nearly perfect closed-packed Al(111) planes, separated by a defect of hexagonal periodicity with parameter 26.5 Å. This structure may explain why the reconstruction can be obtained at lower temperature by deposition of a few aluminum layers, and why Al/Al2O3 multilayers remain coherent, with aluminum of (111) orientation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 312: Symposium P – Common Themes and Mechanisms of Epitaxial Growth , 1993 , 297
Copyright
Copyright © Materials Research Society 1993

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