The diffusive behavior of D in 4N6-purity material was studied at 270 to 600C. The results could be described by:

D (cm2/s) = 4.9 x 10-4 exp[-0.163(eV)/kT]

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