Measurements were made of Bi diffusion in nanocrystalline material. The results showed that diffusion in nanocrystalline samples could be enhanced by more than 10 orders of magnitude with respect to that in monocrystalline material. The results for nanocrystalline material could be described by:

D (cm2/s) = 1.8 x 10-1 exp[-1.0(eV)/kT]

H.J.Höfler, R.S.Averback, H.Hahn, H.Gleiter: Journal of Applied Physics, 1993, 74[6], 3832-9