Abstract
Torrey has developed a theory of dipolar relaxation by atomic diffusion in polycrystalline solids for a model of nearest-neighbour jumps in which the average over crystal orientations was taken in an approximate way. The theory is developed here rigorously in a form which could be readily generalized to a single crystal and to more complicated jump models. As an example it is shown that the Torrey theory for a FCC lattice gives results for T1, T1 rho and T2 that are 2.5% too large for high temperatures and 1.4% too small for low temperatures. The errors would be larger for a BCC lattice and lattices with low coordination numbers.
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