Abstract
The macroscopic diffusivities D and the spin-lattice relaxation rates Γ1 of protons and deuterons in tantalum have been investigated over a wide temperature range. The comparison between D and the dipolar part of Γ1 shows that from 250 K to 410 K protons hop between nearest-neighbour tetrahedral sites. From the mass dependence of D we conclude that tunnelling transitions are important at least up to 810 K. The experimental results on the high temperature hydrogen diffusivity are compatible with the so-called adiabatic mechanism of diffusion. The high temperature relaxation rate Γ1, however, exhibits a not-yet understood anomaly for both protons and deuterons.
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