  We conduct molecular dynamics simulations of 887 and 1389-atom decahedral
platinum nanoparticles using an embedded atom potential. By constructing
microcanonical caloric curves, we identify structural transitions from
decahedral to fcc in the particles prior to melting. The transitions take place
during phase coexistence and appear to occur via melting of the decahedral
structure and subsequent recrystallisation into the fcc structure.
