Abstract
The theory of nuclear spin relaxation is developed for a random walkmodel of hydrogen diffusing between interstitial g sites in the cubicC15 AB2 structure. The theory is applied in analysing the proton relaxation data for low H concentration inTaV2Hx. The random walk theory results are used to assess the accuracy of a simpler modifiedBloembergen–Purcell–Pound model. The temperature dependences of the tworates of jumps between g sites are deduced. The temperature dependence of therate of jumps between g sites on a hexagon shows Arrhenius behaviour above∼50 K and a non-Arrhenius form at lower temperatures. The values of this jump rate areincompatible with the results from the analysis of quasielastic neutron scatteringexperiments. Possible reasons for this discrepancy are suggested.
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