Step-Edge Barriers on Pt(111): An Atomistic View

Journal Article · Mon Nov 30 23:00:00 EST 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.81.5592· OSTI ID:342695

Kyuno, K; 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)

The escape of platinum from Pt(111) islands has been examined in the field ion microscope to obtain a direct view of atomic events. No effective barrier to the escape of platinum clusters larger than dimers is found at step edges, but incorporation of individual adatoms is nevertheless more effective at low temperatures. From the temperature dependence of the rate of atom disappearance from Pt(111) islands, the additional step-edge barrier is found as 0.06{plus_minus}0.01 eV , quite small compared with the diffusion barrier of 0.26thinspthinspeV, and in sharp contrast with deductions from growth experiments. {copyright} {ital 1998} {ital The American Physical Society }

• OSTI ID: 342695
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARRHENIUS EQUATION
ATOMIC CLUSTERS
CRYSTAL GROWTH
DIFFUSION BARRIERS
ION MICROSCOPES
MASS TRANSFER
PLATINUM
TEMPERATURE DEPENDENCE