Test of structural models for the (4×4) phase formed by oxygen adsorption on the Pt3Sn() surface
| Autor: | Andrea Atrei, Marco Torrini, Gianfranco Rovida, M. Hoheisel, Ugo Bardi, Sylvia Speller |
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| Rok vydání: | 2003 |
| Předmět: |
Analytical chemistry
chemistry.chemical_element Surfaces and Interfaces Substrate (electronics) Condensed Matter Physics Oxygen Surfaces Coatings and Films law.invention Overlayer Crystallography chemistry Chemisorption law Phase (matter) Materials Chemistry Scanning tunneling microscope Platinum Tin |
| Zdroj: | Surface Science. 526:193-200 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/s0039-6028(02)02650-x |
| Popis: | Exposure of the Pt3Sn(1 1 1) surface to oxygen at a pressure in the 10 � 6 mbar range at 800 K leads to the formation of a chemisorbed phase with a (4 � 4) periodicity. In previous works we investigated the structure of the (4 � 4) phase by means of scanning tunneling microscopy (STM) and XPD. STM images show that the (4 � 4) periodicity results from an array of protrusions and holes. XPD data suggest that oxygen adsorption induces the reconstruction of the substrate with the formation of a Sn–O overlayer. In the present work, several structural models compatible with the STM and XPD results were tested by tensor LEED analysis. The best agreement with the experimental I–V curves was obtained for a model similar to that proposed to interpret the STM images of the Ag(1 1 1)(4 � 4)–O phase. According to this structure, the protrusions observed in STM would correspond to tin atoms occupying on-top positions. 2002 Elsevier Science B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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