Oxygen chemisorption on transition-metal carbide (100) surfaces studied by X-ray photoelectron spectroscopy and low-energy He+ scattering

R. Souda, T. Aizawa, S. Otani, Y. Ishizawa, C. Oshima

Research output: Contribution to journalArticle

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Abstract

The mechanism for oxidation of the (100) surfaces of TiC, VC, ZrC, and TaC has been studied using X-ray photoemission and low-energy He+ ion scattering. The oxidation of TiC(100) is found to proceed into the bulk even at room temperature by replacing a part of the surface carbon atoms with oxygen and subsequent diffusion of oxygen into the bulk via carbon vacancies suggesting that the preferential bonding of oxygen with carbon exists at the surface. In case of the (100) surfaces of VC and TaC oxidation into the bulk is prevented by formation of an additional metal-oxygen bond at the surface. These significant differences will be elucidated on the basis of the electronic band structures characteristic of the transition-metal carbides.

Original languageEnglish
Pages (from-to)19-26
Number of pages8
JournalSurface Science
Volume256
Issue number1-2
DOIs
Publication statusPublished - 1991 Oct 1

Fingerprint

Chemisorption
carbides
chemisorption
Transition metals
Carbides
X ray photoelectron spectroscopy
transition metals
photoelectron spectroscopy
Scattering
Oxygen
oxygen
scattering
Carbon
x rays
Oxidation
oxidation
carbon
energy
Photoemission
ion scattering

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Oxygen chemisorption on transition-metal carbide (100) surfaces studied by X-ray photoelectron spectroscopy and low-energy He+ scattering. / Souda, R.; Aizawa, T.; Otani, S.; Ishizawa, Y.; Oshima, C.

In: Surface Science, Vol. 256, No. 1-2, 01.10.1991, p. 19-26.

Research output: Contribution to journalArticle

Souda, R. ; Aizawa, T. ; Otani, S. ; Ishizawa, Y. ; Oshima, C. / Oxygen chemisorption on transition-metal carbide (100) surfaces studied by X-ray photoelectron spectroscopy and low-energy He+ scattering. In: Surface Science. 1991 ; Vol. 256, No. 1-2. pp. 19-26.
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