The volume diffusion of 63Ni in monocrystalline samples of the shape-memory ferromagnetic alloy was investigated at 700 to 1033K. The composition was slightly Ni-rich, and the diffusion direction was perpendicular to the (100) plane. The temperature dependence of the volume diffusion coefficient could be described by:

D (m2/s) = 5.49 x 10-8 exp[-146000/RT]

J.Nyéki, G.Erdélyi, T.A.Lograsso, D.L.Schlagel, D.L.Beke: Intermetallics, 2003, 11[10], 1075-7