Surface self-diffusion on Pt(001) by an atomic exchange mechanism

Journal Article · Mon Jun 25 00:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.3143· OSTI ID:6522727

Kellogg, G L; Feibelman, P J ^[1]

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1. Sandia National Laboratories, Albuquerque, NM (USA)

Field-ion microscopy has been used to map the surface sites visited by an individual Pt adatom migrating at 175 K on the Pt(001) plane and to determine its activation energy for surface diffusion. Atomic displacements are found to occur only in the (100) or (010) directions. A surprisingly low activation energy of 0.47 eV is measured. These results are consistent with a model in which the diffusion occurs by an adatom-substrate exchange mechanism. This mechanism is predicted theoretically for self-diffusion on Al(001).

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6522727
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:26; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
ATOM TRANSPORT
DIFFUSION
ELEMENTS
ENERGY
ION MICROSCOPY
LOW TEMPERATURE
MAPPING
MATHEMATICAL MODELS
METALS
MICROSCOPY
NEUTRAL-PARTICLE TRANSPORT
PLATINUM
PLATINUM METALS
RADIATION TRANSPORT
SELF-DIFFUSION
SURFACE PROPERTIES
TRANSITION ELEMENTS