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Surface structure and composition of the missing-row reconstruction of VC0.8(1 1 0): A LEED, GIXRD and photoemission study
Institut Néel, UPR 2940 - CNRS, 25 av. des Martyrs, 38042 Grenoble, France.
Solid State Physics Department, University of Lodz, ul. Pomorska 149/153, 90-236 Lodz, Poland.
De Santis, M., Institut Néel, UPR 2940 - CNRS, 25 av. des Martyrs, 38042 Grenoble, France.
Institut Néel, UPR 2940 - CNRS, 25 av. des Martyrs, 38042 Grenoble, France, Universitat Autonoma de Barcelona, Departamento de Fisica, 08193 Bellaterra, Barcelona, Spain.
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2007 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 601, no 16, 3383-3394 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2007. Vol. 601, no 16, 3383-3394 p.
Keyword [en]
Carbide, Low energy electron diffraction, Photoemission, Surface relaxation and reconstruction, Surface segregation, Surface X-ray diffraction, Vacancy, Vanadium
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-48900DOI: 10.1016/j.susc.2007.06.012OAI: diva2:269796
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2013-05-07

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