The migration of Ag in nanocrystalline Cu was measured at 303 to 373K. The results could be described by:

D (m2/s) = 3 x 10-8 exp[-0.63(eV)/kT]

at 353 to 373K, and by

D (m2/s) = 1 x 10-12 exp[-0.39(eV)/kT]

at 303 to 343K.

S.Schumacher, R.Birringer, R.Strauss, H.Gleiter: Acta Metallurgica, 1989, 37[9], 2495-8