Abstract
The technique of "tone-bursting" for the determination of spin–lattice relaxation times has been extended to quadrupolar nuclei and applied to two ferroelectric crystals: lithium tantalate and lithium niobate. The approach has been to analytically follow the populations of the Zeeman quadrupole levels through each passage through resonance and determine the effective T1 from the decrease in magnetization. The analytic results agree with the computer results obtained by Creel and Barnes. The results also agree with the conclusion of Walstedt that the relaxation rate is enhanced by a factor of [Formula: see text] when only the central resonance is being irradiated in a quadrupolar split pattern.Application of the technique to 7LiTaO3 yields a value of 3.0 ± 1.0 s for the effective T1, dominated by magnetic dipole relaxation. For 7LiNbO3, the effective T1 is 33 ± 5.0 s for the central transition and the relaxation mechanism is predominantly electric quadrupole relaxation.
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