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Abstract
Hydrogen behavior in the α phase of Mg 2NiH x system was studied by 1H NMR. 1H NMR spectra and spin-lattice relaxation times, T 1 and T 1ρ, of Mg 2NiH 0.22 were measured in the temperature range between 100 and 480 K. The drastic change in the linewidth is observed between 170 and 340 K, and 1H rigid lattice is observed below 170 K, from which it is deduced that the hydrogen atoms are randomly distributed in α-Mg 2NiH x . The relaxation mechanism for t 1 is the paramagnetic one, while the T 1ρ value is determined partially by hydrogen diffusion. The hydrogen diffusion rate has been determined from the linewidth and the T 1ρ value. The paramagnetic relaxations observed in T 1 and T 1ρ have been discussed relating to the hydrogen diffusion.
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