The magnetic relaxation method was applied to this cubic Laves phase in order to study low-temperature H diffusion. Two relaxation maxima were detected, at 82 and 108K. The 108K relaxation was attributed to an orientational after-effect in the absence of interactions between H atoms. This relaxation was attributed

to atomic H jumps between the preferentially occupied interstitial tetrahedral sites that were formed by two Fe atoms and two Zr atoms. By means of thermal degassing, the long-range diffusion was found to be described by:

D (cm2/s) = 3.0 x 10-4 exp[-0.38(eV)/kT]

C.U.Maier, H.Kronmüller: Journal of Physics - Condensed Matter, 1992, 4[18] 4409-20