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- W2048105121 abstract "$ensuremath{beta}$-uranium-hydride and $ensuremath{beta}$-uranium-deuteride are ferromagnetic with Curie temperatures of 182 and 178ifmmode^circelsetextdegreefi{}K, respectively. Nuclear-magnetic-resonance studies of the proton in $ensuremath{beta}$-U${mathrm{H}}_{3}$, and of the deuteron in $ensuremath{beta}$-U${mathrm{D}}_{3}$, were made in the paramagnetic state of these compounds. The measured hydrogen Knight shifts ($K$) in $ensuremath{beta}$-U${mathrm{H}}_{3}$ and $ensuremath{beta}$-U${mathrm{D}}_{3}$ are given by $K=(0.40ifmmodepmelsetextpmfi{}0.03){ensuremath{chi}}_{M}$, where ${ensuremath{chi}}_{M}$ is the molar susceptibility. The second moments are determined as ${M}_{2}=(24ifmmodepmelsetextpmfi{}2)+(45ifmmodepmelsetextpmfi{}3)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}{h}^{2}$ ${mathrm{Oe}}^{2}$ in $ensuremath{beta}$-U${mathrm{H}}_{3}$, and ${M}_{2}=(56.4ifmmodepmelsetextpmfi{}1.5)+(48.5ifmmodepmelsetextpmfi{}3)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}{h}^{2}$ ${mathrm{Oe}}^{2}$ in $ensuremath{beta}$-U${mathrm{D}}_{3}$, where $h=frac{{H}_{0}}{(Tensuremath{-}ensuremath{theta})}$, $ensuremath{theta}$ being the appropriate paramagnetic Curie temperature. Analysis of the linewidth, line shape, and second moment showed that there are three line-broadening mechanisms (four in the deuteride): internuclear dipolar broadening, the (classical) dipolar field of the $5f$ electrons on the uranium ions, and an effect due to the use of powder samples (in the deuteride, a quadrupolar interaction is also present, with $|frac{{e}^{2}mathrm{qQ}}{h}|=14.5ifmmodepmelsetextpmfi{}0.5$ kHz). The line shapes, due to the simultaneous presence of several broadening mechanisms, are discussed in some detail. The $5f$ electrons are shown to be localized and do not form a band. The ferromagnetic interaction was analyzed using a simple Ruderman-Kittel-Kasuya-Yosida model, from which it is deduced that the coupling constant $ensuremath{Gamma}ensuremath{sim}20$ eV ${mathrm{AA{}}}^{3}$, $frac{{m}^{*}}{{m}_{e}}ensuremath{sim}3$, and the concentration of conduction electrons is about 2.5 per uranium ion. The Knight shift and quadrupole shielding were calculated, assuming the presence of a high-density interacting electron gas. At temperatures above 370ifmmode^circelsetextdegreefi{}K, line narrowing was observed, from which the activation energy for hydrogen diffusion was obtained as $E=8.4ifmmodepmelsetextpmfi{}0.9$ kcal/mole for the hydride and 8.9ifmmodepmelsetextpmfi{}0.9 kcal/mole for the deuteride. It was concluded, on the basis of the pre-exponential term ${ensuremath{tau}}_{0}$ of the correlation time ${ensuremath{tau}}_{c}$, that diffusion takes place by a vacancy mechanism, and that the higher values of ${ensuremath{tau}}_{0}$ and ${ensuremath{tau}}_{c}$ for the deuterium are mainly due to a difference in the relaxation mechanism. The valency of the uranium ions present has not been definitely established; they are either ${mathrm{U}}^{3+}$ or ${mathrm{U}}^{4+}$, probably the latter." @default.
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- W2048105121 date "1970-03-01" @default.
- W2048105121 modified "2023-10-16" @default.
- W2048105121 title "Nuclear Magnetic Resonance in Uranium Hydride and Deuteride" @default.
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- W2048105121 doi "https://doi.org/10.1103/physrevb.1.1958" @default.
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