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Reconstruction of the Pt50Ni50(100) surface: a LEED and STM study
KTH, Superseded Departments, Physics.
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1995 (English)In: Surface Science, ISSN 00396028 (ISSN), Vol. 327, no 1-2, 100-120 p.Article in journal (Refereed) Published
Abstract [en]

The structure of the Pt50Ni50(100) surface was investigated by low energy electron diffraction (LEED) and scanning tunnelling spectroscopy (STM). Superstructures corresponding to 12 × 1 and 19 × 1 reconstructions were observed in the LEED pattern, and these reconstructions were identified with atomic resolution by STM. The reconstructed surface layer has a quasi-hexagonal atomic mesh with almost (111) atomic density and is divided into terraces and domains the size of which can be more than a thousand ångströms. The domains are corrugated with protrusions made up by 5 × 1 subunits of the quasi-hexagonal mesh and with valleys containing depressed atoms or 2 × 1 subunits. The 12 × 1 and 19 × 1 periodicities are determined by the sequence of valleys; depending on the thermal treatment, one or the other dominates but both generally coexist on the terrace. Owing to the complexity of the structure, LEED calculations were performed for a simplified model with surface atoms situated in a planar net and uniform quasi-hexagonal meshes. We find that in both reconstructions the two surface layers are significantly enriched with platinum. The top layer enrichment is consistent with previous Auger measurements. © 1995.

Place, publisher, year, edition, pages
1995. Vol. 327, no 1-2, 100-120 p.
Keyword [en]
Alloys, Low energy electron diffraction (LEED), Low index single crystal surfaces, Scanning tunneling microscopy, Surface relaxation and reconstruction, Surface segregation, Surface structure, morphology, roughness, and topography, Atoms, Calculations, Heat treatment, Low energy electron diffraction, Morphology, Platinum alloys, Relaxation processes, Single crystals, Surface roughness, Atomic density, Atomic resolution, Quasi hexagonal atomic mesh, Surface reconstruction, Surface relaxation, Surface topography, Surface structure
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-83034OAI: oai:DiVA.org:kth-83034DiVA: diva2:502758
Note
Correspondence Address: Gauthier, Y.; Laboratoire de Cristallographie, CNRS, BP 166 X, 38042 Grenoble Cedex 09, France; email: rsmy213@idris.fr NR 20140805Available from: 2012-02-14 Created: 2012-02-12 Last updated: 2012-02-14Bibliographically approved

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