Selected properties of a 2869-atom Ni_core@Ag_shell nanoparticlewith 28% silver, having its silver shell initially allocated as the outermost icosahedral shell over an icosahedral nickel core (shown as an inset in the upper panel), or forming a capping side in a Janus-like fashion (shown as an inset in the lower panel), as a function of increasing time and decreasing temperature: bond-orientational order parameter between nickel bonds, and asphericity parameter.