Electric field inhibition and promotion of exchange diffusion on Pt(001)

Journal Article · Sun Mar 14 23:00:00 EST 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.70.1631· OSTI ID:6739240

Kellogg, G L ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Direct observations of a Pt adatom migrating on the Pt(001) plane in the presence of an externally applied electric field show that a positive field raises, and a negative field lowers, the activation barrier for the adatom--substrate-atom exchange process. At field strengths of 1.5 V/A and above, inhibition of the exchange mechanism is sufficient to change the diffusion mode from exclusively exchange displacements to a mode that includes hops. The effect of the electric field is explained by an electron-transfer process which changes the bonding of the adatom to neighboring surface atoms.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6739240
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 70:11; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ADSORPTION
ATOM TRANSPORT
BONDING
DIFFUSION
ELECTRIC FIELDS
ELECTRON TRANSFER
ELEMENTS
EXCHANGE INTERACTIONS
FABRICATION
INTERACTIONS
ION SPECTROSCOPY
JOINING
METALS
NEUTRAL-PARTICLE TRANSPORT
PLATINUM
PLATINUM METALS
RADIATION TRANSPORT
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS