The migration of H in undoped and B-doped samples was studied, at temperatures ranging from 588 to 1214K, by monitoring the out-gassing of H-charged spheres. The diffusivity data was shown to fall into 2 groups which reflected the existence of a structural discontinuity at about 770K. In both cases, the H diffusivity obeyed the Arrhenius equation. The presence of 0.02at%B had no appreciable effect upon the H diffusivity. The latter was relatively high and, at 300K, approached that for H in body-centered cubic Fe at this temperature.

L.Yang, R.B.McLellan: Journal of the Physics and Chemistry of Solids, 1996, 57[2], 233-6