The grain-boundary diffusion of Cr in Nb bicrystals with 8° [¯110]/[112] symmetrical tilt boundaries was measured at 947 to 1150C by using electron probe microanalysis methods. The grain-boundary diffusion coefficient was described by:

D (cm2/s) = 1.16 x 10-2 exp[-42.96(kcal/mol)/RT]

X.M.Li, Y.T.Chou: Philosophical Magazine Letters, 1992, 66[6], 281-5