The diffusive behavior of H in 3N87-purity material was studied at 270 to 600C. The results could be described by:

D (cm2/s) = 3.5 x 10-4 exp[-0.05(eV)/kT]

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