Cluster diffusion and surface morphological transitions on Pt (111) via reptation and concerted motion
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
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.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-47622DOI: 10.1016/S0040-6090(99)00892-5OAI: oai:DiVA.org:liu-47622DiVA: diva2:268518