Melting Behaviour of Core-Shell Structured Ag--Rh Bimetallic Clusters
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Abstract
The melting behaviour of four typical core-shell structured 309-atom Ag--Rh bimetallic clusters, with decahedral and icosahedral geometric configurations, is investigated by using molecular dynamics simulation, based on the Sutton--Chen potential. The initial atomic configurations are obtained from semi-grand canonical ensemble Monte Carlo simulations. It is found that the melting point temperature Tm increases with the mole fraction of Rh in the bimetallic clusters, and Tm of Ag--Rh icosahedral clusters is higher than those of Ag--Rh decahedral clusters with the same Rh mole fraction. It is also found that the Ag atoms lie on the surface of Ag--Rh bimetallic clusters even after melting.
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