Diffusion in 3N5-purity material was determined by using gas-phase, ion and electrochemical permeation techniques at 240 to 970K. The data could be described by:

D (cm2/s) = 3.35 x 10-4 exp[-0.052(eV)/kT]

Y.Hayashi, H.Hagi, A.Tahara: Zeitschrift für Physikalische Chemie, 1989, 164[1], 815-20