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Reconstruction of t...
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Gauthier, Y.
(författare)
Reconstruction of the Pt50Ni50(100) surface : a LEED and STM study
- Artikel/kapitelEngelska1995
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LIBRIS-ID:oai:DiVA.org:kth-83034
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-83034URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Correspondence Address: Gauthier, Y.; Laboratoire de Cristallographie, CNRS, BP 166 X, 38042 Grenoble Cedex 09, France; email: rsmy213@idris.fr NR 20140805
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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.
Ämnesord och genrebeteckningar
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NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
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NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
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Alloys
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Low energy electron diffraction (LEED)
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Low index single crystal surfaces
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Scanning tunneling microscopy
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Surface relaxation and reconstruction
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Surface segregation
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Surface structure
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morphology
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roughness
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and topography
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Atoms
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Calculations
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Heat treatment
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Low energy electron diffraction
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Morphology
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Platinum alloys
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Relaxation processes
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Single crystals
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Surface roughness
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Atomic density
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Atomic resolution
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Quasi hexagonal atomic mesh
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Surface reconstruction
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Surface relaxation
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Surface topography
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Surface structure
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Baudoing-Savois, R.
(författare)
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Rundgren, J.
(författare)
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Hammar, M.KTH,Fysik
(författare)
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Göthelid, M.
(författare)
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KTHFysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Surface Science327:1-2, s. 100-1200039-6028
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