Rich Ground State Chemical Ordering in Nanoparticles: Exact Solution of a Model for Ag-Au Clusters

Peter Mahler Larsen, Karsten Wedel Jacobsen, Jakob Schiøtz*

*Corresponding author for this work

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Abstract

We show that nanoparticles can have very rich ground state chemical order. This is illustrated by determining the chemical ordering of Ag-Au 309-atom Mackay icosahedral nanoparticles. The energy of the nanoparticles is described using a cluster expansion model, and a Mixed Integer Programming (MIP) approach is used to find the exact ground state configurations for all stoichiometries. The chemical ordering varies widely between the different stoichiometries, and display a rich zoo of structures with non-trivial ordering.
Original languageEnglish
Article number256101
JournalPhysical Review Letters
Volume120
Issue number25
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2018

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