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• W1968867811 abstract "The diffusion of hydrogen in a single crystal of bcc tantalum (Ta${mathrm{H}}_{0.02}$) at 584 K has been investigated by neutron-quasielastic scattering at a variety of crystal orientations, and over a range of wave-vector transfer $|stackrel{ensuremath{rightarrow}}{mathrm{Q}}|$, from 0.8 to 2.5 ${mathrm{AA{}}}^{ensuremath{-}1}$. A detailed analysis of the observed quasielastic line shapes and widths shows that the results cannot be fitted by any simple jump-diffusion model involving instantaneous jumps between octahedral and tetrahedral interstitial sites. The quasielastic width curves (full width at half-maximum versus $stackrel{ensuremath{rightarrow}}{mathrm{Q}}$) are much more isotropic than those predicted by any of the hydrogen-jump models, although the general shape of the widths at large $Q$ is closer to that predicted by a tetrahedral-site model. These results are in distinct contrast to a recent neutron study of hydrogen diffusion in single-crystal (fcc) palladium, where the details of the quasielastic scattering were fitted well by a model assuming instantaneous jumps between octahedral sites. The Ta${mathrm{H}}_{0.02}$ quasielastic peaks suggest a diffusion relaxation time between 1 and 2 ps at 584 K. Analysis of the data also provides an average mean-square hydrogen vibration amplitude of 0.040 ${mathrm{AA{}}}^{2}$. The present single-crystal results are in reasonable agreement with the results of a previous neutron study of polycrystalline ($ensuremath{alpha}$-phase) $mathrm{Ta}{mathrm{H}}_{x}$. In addition, a value for the macroscopic diffusion constant at 584 K of 2.8 ifmmodetimeselsetexttimesfi{} ${10}^{ensuremath{-}5}$ ${mathrm{cm}}^{2}$ ${mathrm{s}}^{ensuremath{-}1}$ is derived from the low-$Q$ results, which is in excellent agreement with the value predicted from Gorsky-effect measurements." @default.
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• W1968867811 date "1974-06-01" @default.
• W1968867811 modified "2023-10-09" @default.
• W1968867811 title "Neutron-quasielastic-scattering study of hydrogen diffusion in a single crystal of tantalum" @default.
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• W1968867811 doi "https://doi.org/10.1103/physrevb.9.5039" @default.
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