It was found that the data for Se, at 1000 to 1300C, could be described by:

D (cm2/s) = 1.9 x 10-3 exp[-10.3(kcal/g-atom)/RT]

T.Ejima, N.Inagaki, M.Kameda: Transactions of the Japan Institute of Metals, 1968, 9, 172-80