Superstructures on thin Al2O3 grown on Ni3Al(001)

O. Kurnosikov, C.F.J. Flipse, H.J.M. Swagten, B. Koopmans, W.J.M. Jonge, de

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Abstract

Thin ordered layers of Al2O3 grown on a metallic Ni3Al(0 0 1) substrate were studied using UHV STM and LEED. The oxidn. of the substrate at 800 K and 1100 K forms different structural phases of Al2O3. Oxidn. of Ni3Al(0 0 1) at 800 K leads to a simple surface pattern, while oxidn. at 1100 K results in a variety of surface patterns revealing superimposed quasi-periodic superstructures larger than expected from a simple moire model. At. resoln. achieved with STM on the Al2O3 surface allows us to det. all possible mutual orientations of the cryst. lattices. The spectroscopic STM dI/dV plots indicated different electronic properties at various points on the oxide superstructure. We conjecture that they can be attributed to ordering of structural patches distributed in a regular way. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)4375-4379
JournalSurface Science
Volume600
Issue number18
DOIs
Publication statusPublished - 2006

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