The diffusion of Pb was studied at 600 to 780C. The results could be described by:

D (cm2/s) = 5.4 x 10-1 exp[-37.0(kcal/mol)/RT]

S.K.Sen, M.B.Dutt, A.K.Barua: Physica Status Solidi A, 1975, 32[1], 345-50