Structures of AgPd nanoclusters adsorbed on MgO(100): A computational study

Fabio R. Negreiros, Giovanni Barcaro, Zdenka Kuntová, Giulia Rossi, Riccardo Ferrando*, Alessandro Fortunelli

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

The structures of AgPd clusters supported on MgO(100) are investigated via a combination of global optimization searches within an atom-atom potential model and density-functional calculations. Although pure Ag and Pd clusters favor fcc structures in (100) epitaxy with the substrate, it is found that AgPd mixing creates a pocket of stability for polyicosahedral structures in the AgPd/MgO(001) nanoalloy phase diagram. Polyicosahedra are very stable for size around 40 atoms, where they compete with fcc(100) and decahedral structures. For clusters with up to 200 atoms and 50%-50% composition, these last two structural motifs are the most stable ones at the atom-atom potential level. For sizes of 400 atoms, fcc structures in (111) epitaxy with the substrate become close in energy to fcc(100) and Dh clusters, indicating a likely transition to (111) epitaxy for larger sizes.

Original languageEnglish
Pages (from-to)483-488
Number of pages6
JournalSurface Science
Volume605
Issue number5-6
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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