Ternary alloying effect on the melting of metal clusters
Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, P.R. China
Corresponding author: a email@example.com
Revised: 2 August 2008
Published online: 27 September 2008
Canonical ensemble Monte Carlo simulations are applied to investigate the melting of the icosahedral 55-atom Ag-Cu-Au clusters. The clusters are modeled by the second-moment approximation of the tight-binding (TB-SMA) many-body potentials. Results show that the introduction of the only Cu atom of the third alloying metal in the bimetallic Ag43Au12 cluster, forming the Ag42Cu1Au12 cluster, can greatly increase the melting point of the cluster by about 100 K. It is also found that the substitution of the only Cu atom of the third alloying metal in the Ag1Au54 clusters, forming the Ag1Cu1Au53 cluster, can result in an increase of 40 K in the melting point. It can be concluded that the melting points of the bimetallic clusters can be tuned by the third metal impurities doping. In addition, the surface segregation of Ag atoms in the Ag-Cu-Au trimetallic clusters occurs even after melting.
PACS: 64.70.kd – Metals and alloys / 64.70.Nd – Structural transitions in nanoscale materials / 65.80.+n – Thermal properties of small particles, nanocrystals, and nanotubes
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008