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Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.48: Poster

Wednesday, February 27, 2008, 18:30–19:30, Poster F

Study of formation and thermal stability of Fe layers on ZnO surfacesAlexander Demund, Daniel Wett, Sylvia Reiche, Rüdiger Szargan, and •Reinhard Denecke — Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig

Formation and thermal stability of Fe layers on ZnO surfaces have been studied by means of X-ray Photoelectron Spectroscopy and Low Energy Electron Diffraction. Experiments were performed on the polar surfaces ZnO(0001) and ZnO(000-1) and on the non-polar (1120) surface. The results indicated a pseudo 2D growth mode for iron on ZnO at room temperature, which was less pronounced on the Zn-terminated (0001) surface. Under ultra high vacuum conditions low coverages of deposited Fe0 on all ZnO single crystal surfaces were partially oxidized by a small fraction of residual -OH-groups and ZnO to FeO. A strong temperature dependence of the interface reactivity was found upon annealing. Starting from 200 - 300C iron was first oxidized to bivalent iron oxide. After complete oxidation of Fe0 to Fe2+ at around 400C, Fe2+ reacted to Fe3+. Above temperatures of 500C the deposited metallic iron was completely oxidized to trivalent iron. Differences observed for the different surface orientations will be discussed.

Work has been supported by DFG (FG 404 Sz58/15).

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