The diffusive behavior of 198Au in 5N-purity material was studied at 369 to 655C. The results could be described by:

D (cm2/s) = 1.31 x 10-1 exp[-27.79(kcal/mol)/RT]

N.L.Peterson, S.J.Rothman: Physical Review B, 1970, 1[8], 3264-73