OXYGEN AND POTASSIUM ADSORPTION ON A CARBIDE-MODIFIED STEPPED-W(100)IN CONTACT WITH THE CARBON SOLID SOLUTION: AN AES AND WF STUDY AT 300 K AND AT ELEVATED TEMPERATURES

S. D. Foulias, A. Perdikis and D. Vlachos ()
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S. D. Foulias: Department of Physics, University of Ioannina, P. O. Box 1186, GR-451 10 Ioannina, Greece
A. Perdikis: Department of Physics, University of Ioannina, P. O. Box 1186, GR-451 10 Ioannina, Greece
D. Vlachos: Department of Physics, University of Ioannina, P. O. Box 1186, GR-451 10 Ioannina, Greece

Surface Review and Letters (SRL), 2005, vol. 12, issue 05n06, 787-792

Abstract: The adsorption of oxygen and potassium on the two-phase system: carbide-modified stepped-W(100)surface (CMT) in contact with the solid solution of carbon in bulk tungsten, was investigated by AES and WF measurements. The CMT surface shows metallic behavior judging from its interaction withK. The expected dissociative adsorption of oxygen appears to occur with1 - θkinetics, possibly via a molecularly chemisorbed state. The "dispersed phase — two-phase" model is clearly applicable when oxygen adsorbs on theK-pre-covered carbide. The initial sticking coefficient of oxygen increases drastically from the dispersed to the condensed phase, at least four-fold with respect tos0on the clean carbide. It is proposed that this two-phase carbon system can be advantageous compared with the bulk carbide since it can easily regenerate the surface if the latter is depleted from carbon.

Keywords: Auger Electron Spectroscopy (AES); Work Function (WF); surface carbide; tungsten carbide; alkali deposition; oxygen adsorption; adsorption kinetics; surface segregation; transition metal carbides; carbon diffusion (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05007967

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