We report the first straightforward measurements of the diffusion coefficient of
hydrogen migrating in icosahedral (i-) quasicrystal ribbons of Ti45Zr38Ni17
and in two-phase bulk samples containing both the i-phase and the Laves phase.
It is found that at 273–353 K diffusion obeys Arrhenius’s law with activation
energy 0.24 eV and that the ratio of the volumes of the phases changes at
hydrogenization.
The electrical resistivity of icosahedral quasicrystals Ti 41.5 Zr 41.5 Ni 17 is investigated in the temperature region between 0.3 and 300 K on samples of different quality. At temperatures between 0.3 and 2 K the influence of external magnetic fields up to 16 kOe on the superconducting transition of these materials is investigated. The temperature dependence of the resistivity in the region of the superconducting transition varies in a step-like manner. The data of the x-ray analysis imply the presence of several different quasicrystalline phases. Above the superconducting transition a resistivity minimum is observed.
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