STEP REARRANGEMENT UPON LOW PRESSURE OXIDATION OF THEPt3Ti(510)SURFACE: A STUDY BY SCANNING TUNNELING MICROSCOPY

I. Kurzina, V. Shevlyuga, A. Atrei, B. Cortigiani, G. Rovida and U. Bardi ()
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I. Kurzina: Tomsk State University of Architecture and Buildings, 634003 Tomsk, Russia
V. Shevlyuga: General Physics Institute, Russian Academy of Sciences, Moscow, Russia
A. Atrei: Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, Universitá di Siena, Siena, Italy
B. Cortigiani: Dipartimento di Chimica, Universitá di Firenze, Polo Scientifico di Sesto Fiorentino, 50019 Sesto Fiorentino (Fi), Italy
G. Rovida: Dipartimento di Chimica, Universitá di Firenze, Polo Scientifico di Sesto Fiorentino, 50019 Sesto Fiorentino (Fi), Italy
U. Bardi: Dipartimento di Chimica, Universitá di Firenze, Polo Scientifico di Sesto Fiorentino, 50019 Sesto Fiorentino (Fi), Italy

Surface Review and Letters (SRL), 2003, vol. 10, issue 06, 861-866

Abstract: The oxidation of the single crystal steppedPt3Ti(510)surface at oxygen pressures below10-5mbar 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 cleanPt3Ti(510)surface consists of (100) terraces separated by double atomic steps. The exposure of the clean surface to oxygen at pressures in the range of10-7–10-5mbar 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.

Keywords: Platinum; titanium; alloy; oxidation; stepped surface; STM (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0218625X03005633

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