Step-edge segregation of bimetallic alloys - A LEIS study of Pt25Rh75(410)

B. Moest, P.T. Wouda, A.W. Denier van der Gon, M.C. Langelaar, H.H. Brongersma, B.E. Nieuwenhuys, D.O. Boerma

    Research output: Contribution to journalArticleAcademicpeer-review

    20 Citations (Scopus)

    Abstract

    We demonstrate that low energy ion scattering can be used to study the step-edge composition on vicinal single crystal surfaces. Employing the shadowing and focusing effects inherent to ion scattering, it is possible to perform site-specific composition measurements on single crystal surfaces over a wide temperature range. By combining these measurements with ion trajectory simulations we have extracted quantitative information concerning the step-edge composition. This technique has been applied to the Pt25Rh75(4 1 0) surface in the temperature range between 400°C and 700°C. The experiments reveal a much stronger Pt enrichment of the step edges than at the terrace sites. This difference between the step-edge composition and the terrace site composition is significantly larger than predicted by simple segregation models based on bond breaking.
    Original languageEnglish
    Pages (from-to)159-171
    JournalSurface Science
    Volume473
    Issue number3
    DOIs
    Publication statusPublished - 2001

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