Abstract
Adsorption of oxygen on the (112̄0) surface of hexagonal cobalt at 100 and 320 K has been studied by means of low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), UV photoelectron spectroscopy (UPS), change of work function (Δφ) and Auger electron spectroscopy (AES). At 100 K, adsorbed oxygen and Co 3O 4 features are observed, as identified by the UP spectra. During heating, a conversion into CoO takes place. This process is completed at 230 K and followed by dissolution of oxygen in the bulk at temperatures exceeding 450 K. Admission of oxygen at 320 K leads to identical results, but the total amount of adsorbed oxygen is approximately 30% lower. LEED experiments show a (1 × 3) superstructure at low coverages. After higher exposures, CoO formation, as revealed by the photoelectron data, is indicated by a changed diffraction pattern. It is concluded that an epitaxial growth of CoO(100) takes place.
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