Abstract
We report the results of a proton nuclear magnetic resonance (NMR) study of hydrogen in solid solution in h.c.p. yttrium (α-YH 0.2) over the temperature range 77–715 K. The concept of hydrogen “pairing” in closely adjacent tetrahedral (T) sites in the metal lattice is not supported by lineshape measurements, and the dipolar contribution to the spin-lattice relaxation time ( T 1) is consistent with random occupancy of T-sites. The T 1 measurements yield an activation energy for hydrogen diffusion of 0.51 eV atom − 1, in excellent agreement with recent inelastic neutron-scattering results.
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