Issue 11, 2018

Reassignment of ‘magic numbers’ for Au clusters of decahedral and FCC structural motifs

Abstract

Calculations of low free energy structures of gold clusters with a few hundred to a few thousand atoms have been performed. For the study to be computationally feasible, a systematic scheme for generating low energy atomic structures with a given structural motif and a chosen size is used. Comparison of the relative stability of clusters with the decahedral and FCC motifs reveals periodic windows of stability for asymmetric, open-shell FCC clusters while the stability of the decahedral structural motif shows a smoother variation in stability with cluster size. As a result, the FCC structural motif is most stable for clusters with around 440, 610, 800, 1050… atoms, while the decahedral motif is more stable for atomic numbers of around 525, 705, 925, 1175… These new ‘magic numbers’ represent regions around which a number of asymmetric, open shell clusters of a given motif are most stable, in contrast to the discrete set of highly symmetric magic size structures that are commonly cited. As temperature is raised, the decahedral motif gains stability over the FCC motif. These results help explain reported experimental observations and can guide future laboratory preparations of shape selected clusters.

Graphical abstract: Reassignment of ‘magic numbers’ for Au clusters of decahedral and FCC structural motifs

Supplementary files

Article information

Article type
Paper
Submitted
19 Dec 2017
Accepted
20 Feb 2018
First published
21 Feb 2018

Nanoscale, 2018,10, 5124-5132

Reassignment of ‘magic numbers’ for Au clusters of decahedral and FCC structural motifs

A. L. Garden, A. Pedersen and H. Jónsson, Nanoscale, 2018, 10, 5124 DOI: 10.1039/C7NR09440J

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