Abstract
We report the results of Gorsky effect, neutron scattering and Mössbauer effect experiments in which we studied various correlated transport properties (diffusion coefficients) of hydrogen in tantalum at high hydrogen concentrations (up to a hydrogen-to-tantalum atomic ratio c of 0.75). In the Gorsky effect measurements we determined the decay rate (described by the chemical or Fick diffusion coefficient) and the amplitude of the hydrogen density fluctuations which extended spatially over large ( i.e. sample) dimensions. Secondly we used neutron spectroscopy to measure the self-diffusion (tracer diffusion) coefficient of hydrogen which describes the diffusive motion of a single (tagged) hydrogen interstitial. Finally we used Mössbauer relaxation experiments employing the high resolution 6.2 keV γ resonance of 181Ta to study the amplitude and decay rate of hydrogen density fluctuations with dimensions of the order of a lattice parameter.
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