The diffusive behavior of D in 3N84-purity material was studied at 120 to 600C. The results could be described by:

D (cm2/s) = 5.4 x 10-4 exp[-0.129(eV)/kT]

G.Schaumann, J.Völkl, G.Alefeld: Physica Status Solidi, 1970, 42[1], 401-13