Supperheating and melting behaviors of Ag clusters with Ni coating studied by molecular dynamics and experiments

摘要

Using molecular dynamics with embedded-atom-type interatomic potentials, we simulated the melting behavior of a spherical Ag_3055 cluster coated with Ni. The semi-Coherent Ag/Ni interface formed at low temperatures acts as an effective barrier against the surface melting and leads to a sub- stantial superheating of the Ag cluster. The melting point was found to be about 100 k above the equi- librium melting point of the bulk Ag crystal (1230 K ± 15 K) and about 290 k above that (1040 K) of the free Ag_3055 cluster.