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Adatom/vacancy inte...
Adatom/vacancy interactions and interlayer mass transport in small two-dimensional Pt clusters on Pt(1 1 1)
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- Münger, Peter (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Chirita, Valeriu (författare)
- Linköpings universitet,Tekniska högskolan,Tunnfilmsfysik
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- Hultman, Lars (författare)
- Linköpings universitet,Tekniska högskolan,Tunnfilmsfysik
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Greene, J.E. (författare)
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Surface Science. - 0039-6028 .- 1879-2758. ; 539:1-3
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We use embedded-atom molecular dynamics simulations to follow the dynamics of adatoms, vacancies, and adatom/vacancy pairs on two-dimensional hexagonal Pt19 clusters on Pt(1 1 1) surfaces at 1000 K. All configurations are found to be quite stable and have essentially the same migration mobilities as compact hexagonal clusters. However, the presence of a single vacancy dramatically decreases the lifetime of an adatom on the cluster by a factor of three. This occurs primarily through an enhancement of the rate of push-out/exchange reactions at the outer cluster edge resulting from vacancy-induced softening of edge atom bonds. Overall, adatoms in the presence of vacancies descend to the terrace via vacancy filling 10% of the time, and through reactions with outer cluster edges the remaining 90%. Direct vacancy filling mechanisms are analogous to, and have similar activation energies with, those at outer cluster edges: adatom hopping over descending steps and push-out/exchange reactions. © 2003 Elsevier B.V. All rights reserved.
Nyckelord
- Adatoms
- Clusters
- Growth
- Molecular dynamics
- Nucleation
- Platinum
- TECHNOLOGY
- TEKNIKVETENSKAP
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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