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• W2322156744 abstract "Hydrogen and 23Na NMR were used to probe diffusive motions of the ions in several NaH powders. In three NaH samples, the H resonance is a superposition of broad and narrow components, reflecting the presence of relatively immobile and mobile H, respectively. The fraction of mobile H grows from 23 to 250 °C; this pattern has been observed previously in other ionic hydrides. By 300 °C, the formerly broad hydrogen component has itself motionally narrowed. In these samples, the observation of a smaller amount of 23Na line narrowing by 300 °C indicates that only the H– ions are mobile at 300 °C, leaving 23Na– 23Na dipole interactions unaveraged. A deep minimum in the hydrogen rotating-frame relaxation time T1ρ is observed near 325 °C, as expected from the onset of motional averaging. In a fourth sample, the entire H line is narrowed already by 150 °C. In this sample, the 23Na is also partially narrowed at this temperature and by 175–225 °C, further narrowing of the 23Na resonance indicates that now both ions are in rapid motion. In all the samples, the spin–lattice relaxation times T1 for hydrogen and sodium decrease monotonically with temperature, in qualitative accord with relaxation by physical diffusion of spin magnetization to relaxation centers." @default.
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• W2322156744 date "2012-08-24" @default.
• W2322156744 modified "2023-09-25" @default.
• W2322156744 title "NMR Studies of NaH" @default.
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• W2322156744 doi "https://doi.org/10.1021/jp305810m" @default.
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