A study was made of the diffusion of H in single crystals by performing measurements of the desorption kinetics of gas-saturated crystals. The results, at 350 to 500C, could be described by:

D (cm2/s) = 3.3 x 10-7 exp[-0.27(eV)/kT]

It was concluded that H was dissolved in molecular form.

N.N.Alekseenko, P.V.Volobuev, P.E.Suetin: Soviet Physics - Solid State, 1973, 15[3], 589-90