DIFFUSION OF HYDROGEN IN NANOCRYSTALLINE FE90ZR10

In nanocrystalline Fe90Zr10 produced by crystallization of melt-spun a morphous ribbons, the dependence of the local relaxation processes as well as the long-range diffusion kinetics on the hydrogen concentratio n was studied by magnetic after-effect measurements and thermal desorp tion experiments, respectively. The hydrogen-induced local relaxations and the macroscopic degassing can be assigned to hydrogen diffusion i n grain boundaries and are well described by a potential with a distri bution of site as well as saddle-point energies similar to the amorpho us structure of Fe90Zr10.