Abstract
AbstractThe 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.
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