Abstract
The BPP model for nuclear spin relaxation is modified to accountrigorously for jumps of hydrogen within g site hexagons in the C15AB2 structure. The theory is applied to proton relaxation data for low H concentrations inTaV2Hx and ZrCr2Hx. It is shown that the data are consistent with the results of quantum diffusion calculations,diffusivity measurements and H–H interaction effects deduced from quasielastic neutronscattering experiments.
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