On the Superdiffusion of Hydrogen in Va-Metals

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  • On the Superdiffusion of Hydrogen in <I>V</I><SUB>a</SUB>-Metals
  • On the Superdiffusion of Hydrogen in Va

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Experimental procedures for the determination of superdiffusion coefficients of hydrogen in Va-metals (V, Nb, Ta) under external tensile stress parallel to ⟨111⟩ are described in detail. Results are analyzed in the light of the lattice activated tunneling theory. The activation energy Ea and the tunneling matrix element |J| are obtained experimentally as follows:<BR>Ea[meV]: 21 for V, 15 for Nb, 12 for Ta,<BR>and<BR>|J|[meV]: 0.44 for V, 0.085 for Nb, 0.065 for Ta.<BR>The superdiffusion mechanism of hydrogen in these metals is theoretically discussed.

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