Step rearrangement upon low pressure oxidation of the Pt3Ti(510) surface: A study by scanning tunneling microscopy

I. Kurzina, V. Shevlyuga, A. Atrei, B. Cortigiani, G. Rovida, U. Bardi

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    The oxidation of the single crystal stepped Pt3Ti(510) surface at oxygen pressures below 10-5 mbar and at a temperature of 770 K was studied by means of X-ray photoelectron spectroscopy (XPS), low energy ion scattering (LEIS) and low energy electron diffraction (LEED). Scanning tunneling microscopy (STM) was used to follow the evolution of the surface morphology on the atomic scale. The clean surface studied in ultrahigh vacuum conditions was found by LEIS to be composed of platinum only in the outermost surface plane. LEED and STM indicate that the clean Pt3Ti(510) surface consists of (100) terraces separated by double atomic steps. The exposure of the clean surface to oxygen at pressures in the range of 10 -7-10-5 mbar leads to the growth of a titanium oxide layer (with a composition close to TiO) which covers completely the substrate surface. The TiO film has long range order and exhibits complex LEED patterns. The STM measurements indicate that the ordered array of steps is kept in the early stages of the oxide film growth, whereas a change of the step morphology and step orientation is observed during the oxidation process.

    Original languageEnglish
    Pages (from-to)861-866
    Number of pages6
    JournalSurface Review and Letters
    Volume10
    Issue number6
    DOIs
    Publication statusPublished - 1 Dec 2003

    Keywords

    • Alloy
    • Oxidation
    • Platinum
    • Stepped surface
    • STM
    • Titanium

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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