Surface structure and composition of the missing-row reconstruction of VC<inf>0.8</inf>(1 1 0): A LEED, GIXRD and photoemission study

Y. Gauthier, I. Zasada, M. De Santis, V. Langlais, C. Virojanadara, L. I. Johansson

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Abstract

Low energy electron diffraction, grazing incidence X-ray diffraction and photoemission were used to decipher the detailed structural arrangement and chemical composition of the surface region of a transition metal carbide, VC0.8(1 1 0). In agreement with previous scanning tunneling microscopy (STM) studies, we find that the surface reconstructs with a ridge-and-valley grating structure along the [1 over(1, ̄) 0] direction resulting from {0 0 1} faceting for the (3 × 1) and the (4 × 1) phases. Both superstructures terminate on the vacuum side with a nearly stoïchiometric VC region due to C segregation, in contrast with the conclusions drawn from this previous STM study. However, the present experiments clearly show that these phases are metastable, and slow cooling results in a (1 × 1) surface, which is highly C depleted, similarly to the (1 0 0) face. © 2007 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)3383-3394
JournalSurface Science
Volume601
Issue number16
DOIs
Publication statusPublished - 15 Aug 2007

Keywords

  • Carbide
  • Low energy electron diffraction
  • Photoemission
  • Surface relaxation and reconstruction
  • Surface segregation
  • Surface X-ray diffraction
  • Vacancy
  • Vanadium

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