Atom Movement and Binding on Surface Clusters: Pt on Pt(111) Clusters

Journal Article · Thu Aug 01 00:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.1334· OSTI ID:286989

Goelzhaeuser, A; Ehrlich, G ^[1]

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1. Materials Research Laboratory and Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

Binding and diffusion of single platinum atoms adsorbed on platinum clusters on Pt(111) have been explored using helium-cooled field ion microscopy. Pt atoms deposited on Pt(111) clusters at {ital T}{approximately}20K are found at both fcc and hcp sites. At hcp sites, atoms are more weakly bound; after annealing at temperatures as low as 50K, they occupy fcc sites exclusively. The cluster surface itself is not uniform, however. An {ital empty} {ital zone} separates the central region from the cluster edges: Atoms in the center have to overcome an energy barrier just to cross this empty zone and reach the cluster edges. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: University of Illinois
• DOE Contract Number: FG02-91ER45439
• OSTI ID: 286989
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
ANNEALING
BINDING ENERGY
CRYSTAL GROWTH
DIFFUSION
ION MICROSCOPY
PLATINUM
SOLID CLUSTERS
SURFACE PROPERTIES
SURFACE STRUCTURE