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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2014

Growth and structure of ultrathin alumina films on the (110) surface of gamma-Al4Cu9 complex metallic alloy

Résumé

The first stages of oxidation of the (1 1 0) surface of a gamma-Al4Cu9 complex metallic alloy were investigated by combining x-ray photoemission spectroscopy, low energy electron diffraction and scanning tunnel microscopy studies. Oxidation at room temperature in the 2 x 10(-8) to 2 x 10(-7) mbar oxygen pressure range occurs in two steps: a fast regime is followed by a much slower one, leading to the formation of a thin aluminium oxide film showing no long range order. Cu-O bonds are never observed, due to fast oxygen induced aluminium segregation. The low value of the estimated activation energy for aluminium diffusion (0.65 +/- 0.12 eV at(-1)) was ascribed to the presence of two vacancies in the gamma-Al4Cu9 structure. Annealing at 925K the oxide film formed at room temperature leads to the formation of small crystallized domains with a sixton structure similar to structures reported in the literature following the oxidation of Cu-9% Al(1 1 1), NiAl (1 1 0) and FeAl(1 1 0) surfaces as well as ultrathin Al films deposited onto Cu(1 1 1) or Ni(1 1 1) surfaces. Two contributions were observed in the O1s peaks, which have been ascribed to loosely bound oxygen species and oxygen belonging to the sixton structure respectively.
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Dates et versions

hal-01288108 , version 1 (14-03-2016)

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M. Warde, Julian Ledieu, L. N. Serkovic Loli, M. Herinx, Marie-Cécile De Weerd, et al.. Growth and structure of ultrathin alumina films on the (110) surface of gamma-Al4Cu9 complex metallic alloy. Journal of Physics: Condensed Matter, 2014, 26 (48), ⟨10.1088/0953-8984/26/48/485009⟩. ⟨hal-01288108⟩
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