Grain boundary diffusion of 110mAg in polycrystalline Cu was measured in the type-B (962-675K) or type-C (565-452K) diffusion regimes. In the former regime, the triple-product was found to obey the Arrhenius relationship:

sδD (m3/s) = 1.4 x 10-15 exp[-69.1(kJ/mol)/RT]

Measurements which were performed under C-type conditions showed that the grain-boundary diffusivity was described by:

D (m2/s) = 1.7 x 10-4 exp[-108.6(kJ/mol)/RT]

S.Divinski, M.Lohmann, C.Herzig: Acta Materialia, 2001, 49[2], 249–61