The diffusive behavior of H in 4N6-purity material was studied at 270 to 600C. The results could be described by:
D (cm2/s) = 4.4 x 10-4 exp[-0.140(eV)/kT]
G.Schaumann, J.Völkl, G.Alefeld: Physica Status Solidi, 1970, 42[1], 401-13