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Cluster diffusion and surface morphological transitions on Pt (111) via reptation and concerted motion
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Materials Science Department, Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States.
2000 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 370, no 1, 179-185 p.Article in journal (Refereed) Published
Abstract [en]

Embedded-atom molecular dynamics simulations were used to follow the diffusion dynamics of compact Pt clusters with up to 19 atoms on Pt (111) surfaces. The results reveal a novel cluster diffusion mechanism, involving successive shear translations of adjacent subcluster regions, which give rise to reptation, a snake-like gliding motion. We show that for compact clusters with 4 to 6 atoms, this mechanism competes energetically with that of island diffusion through concerted motion. However, as the cluster size increases from > 7 to ? 20 atoms, reptation becomes the energetically favored diffusion mechanism. The concerted shear motion of subcluster regions, leading to reptation, is also shown to play a significant role in dendritic-to-compact morphological transitions of Pt island.

Place, publisher, year, edition, pages
2000. Vol. 370, no 1, 179-185 p.
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Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47622DOI: 10.1016/S0040-6090(99)00892-5OAI: oai:DiVA.org:liu-47622DiVA: diva2:268518
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Chirita, ValeriuMünger, Peter

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