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| Home > Publications database > Formation of an ordered oxide on the CoGa(100) surface by room temperature oxidation and annealing |
| Journal Article | PreJuSER-40328 |
; ; ; ;
2001
Elsevier
Amsterdam
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Please use a persistent id in citations: doi:10.1016/S0039-6028(01)00977-3
Abstract: The preparation of an ordered GaO3 oxide on the GoGa(1 0 0) surface by exposing the surface to oxygen at room temperature and subsequent annealing has been studied by thermal energy helium atom scattering and Auger electron spectroscopy. During room temperature oxidation a disordered Ga2O3 layer forms. The oxidation process is studied with lie scattering and the results are compared with previously reported scanning tunneling microscopy investigations. Upon annealing, it is found that ordering of the oxide layer proceeds very slowly. Even at a temperature of 800 K, 50 K below the temperature at which the oxide decomposes and disappears from the surface, the ordering process is not yet completed after 1000 s. It is concluded that a smooth oxide film can be prepared by room temperature exposure to oxygen and annealing at temperatures just below decomposition temperature of the oxide (850 K) which is very uniform with respect to thickness. However, the amount of oxygen adsorbing at 300 K is not sufficient to produce a continuous film. About 10-15% of the surface is not covered by the oxide after this preparation method. To prepare a continuous oxide layer several cycles of room temperature oxidation and annealing seem necessary. (C) 2001 Elsevier Science B.V. All rights reserved.
Keyword(s): J ; atom solid scattering and diffraction-inelastic (auto) ; oxidation (auto) ; surface structure, morphology, roughness, and topography (auto) ; cobalt (auto) ; gallium (auto) ; low index single crystal surfaces (auto)
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