Various techniques, including Mössbauer spectroscopy, were used to monitor the diffusion of Co into the surface of monocrystalline samples. The Co was found to occupy either the Pr site of the intermetallic, or the Ni site in surface grains of cubic Ni.

On the Diffusion of Co into PrNi5 W.D.Hutchison, S.J.Harker, T.D.St Quintin, G.A.Stewart, A.Grayevsky, N.Kaplan: Solid State Communications, 1997, 104[2], 113-7