The grain boundary solute diffusion of Ni in Ag polycrystals was investigated systematically by using serial-sectioning technique and the 63Ni isotope. The diffusion of Ni was measured at 589 to 989K. The measurements were performed in the Harrison type-B regime at high temperatures and in the type-C regime at low temperatures. The grain boundary diffusivity of 63Ni could be described by:

sδD (m3/s) = 1.9 x 10-15 exp[-69.2(kJ/mol)/RT]

D (cm2/s) = 3.1 x 10-6 exp[-110.1(kJ/mol)/RT]

T.Surholt, C.Minkwitz, C.Herzig: Acta Materialia, 1998, 46[6], 1849-59