INFLUENCE OF MICROSTRUCTURE ON SHORT-RANGE AND LONG-RANGE DIFFUSION-PROCESSES OF HYDROGEN IN TRANSITION-METAL ALLOYS

The magnetic relaxation and thermal desorption of hydrogen in amorphou s, partially crystallized, nano- and microcrystalline Co90Zr10, Fe60Co 30Zr10 as well as in single-phase Co23Zr6, Fe2Zr have been investigate d. Reorientation processes of hydrogen in topologically disordered or ordered phases lead to a characteristic concentration dependence of th e relaxation modes, i.e. the activation parameters. This allows to ide ntify the phases of heterogeneous systems, which are preferentially oc cupied by hydrogen. Furthermore, a differential analysis of the desorp tion kinetics yields information about the phases participating in the long-range diffusion paths of hydrogen.