Abstract
We report on the direct determination of the hydrogen diffusion constant D in the hydrogen-storage quasicrystalline alloy ZrCuNiAl using the technique of nuclear magnetic resonance diffusion in a static fringe field of a superconducting magnet. The diffusion constant of partially quasicrystalline ${\mathrm{Zr}}_{69.5}{\mathrm{Cu}}_{12}{\mathrm{Ni}}_{11}{\mathrm{Al}}_{7.5}$ exhibits a significant decrease with increasing hydrogen-to-metal ratio $H/M,$ owing to creation of defects in the lattice during hydrogen loading, whereas the actual alloy structure---the amorphous, icosahedral, or approximant---appears to be less important in the hydrogen diffusivity.
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