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(a) The reduced vibrational density of states g(ω) / ω2 for Ni NP having N = 369 as a function of ω at different temperatures. Inset shows the Boson peak frequency versus kT / <u2>. (b) Alloying effect (capping with an 18 % Au by relative mass) on the Boson peak frequency for Ni NP having N = 2899 and r = 2 nm using Sutton-Chen EAM potential.
