Measurements of the diffusion coefficient of H migrating in icosahedral quasi-crystalline ribbons of Ti45Zr38Ni17 and in 2-phase bulk samples containing both the icosahedral phase and the Laves phase were reported. It was found that, at 273 to 353K, the diffusivity could be described by:

ribbons:     D (cm2/s) = 1.0 x 10-1 exp[-0.24(eV)/kT]

bulk:     D (cm2/s) = 5.0 x 10-5 exp[-0.25(eV)/kT]

V.Azhazha, A.Grib, G.Khadzhay, S.Malikhin, B.Merisov, A.Pugachov: Journal of Physics - Condensed Matter, 2003, 15[29], 5001-8