title: Small Pd Clusters, up to the tetramer at least, are highly mobile on the MgO(100) surface.
abstract: Density functional theory calculations predict that small clusters of Pd atoms, containing up to at least four atoms, are highly mobile on the MgO(100) surface with the tetramer having the largest diffusion rate at room temperature--larger than the monomer. Surface vacancies are found, however, to bind the larger clusters strongly enough to trap them. These are important considerations when analyzing the growth and sintering of metal islands on oxide surfaces, in particular, the role of point defects.
authors.affiliation: Department of Chemistry 351700, University of Washington, Seattle, Washington 98195-1700, USA.
authors.forename: Lijun
authors.initials: L
authors.lastname: Xu
authors.forename: Graeme
authors.initials: G
authors.lastname: Henkelman
authors.forename: Charles T
authors.initials: CT
authors.lastname: Campbell
authors.forename: Hannes
authors.initials: H
authors.lastname: Jónsson