Influence of Proton Exchange on NMR Relaxation Mechanism of 7Li
DOI:
https://doi.org/10.15407/ujpe60.05.0401Keywords:
method of nuclear magnetic resonance, proton exchange, relaxationAbstract
The temperature dependence of the 7Li spin-lattice relaxation time in the temperature interval 170–340 K has been studied in undoped and proton-exchanged powder specimens of LiNbO3. An anomaly in the temperature behavior of the relaxation time T1 in the temperature interval 300–340 K is revealed in both specimens, which is related to the local lattice reconstruction. On the basis of the activation energy values calculated from the T1(T) dependence, a conclusion is made that the dominant relaxation mechanism in the considered temperature interval is the tunneling of Li ions between sublattice vacancies. The difference between the activation energies for two polycrystals is explained by the transition from a symmetric three-well potential to an asymmetric one owing to the appearance of oxygen vacancies and the localization of impurity protons in the oxygen plane.
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