Abstract
7Li nuclear magnetic resonance relaxation times T1,T1ρ and T2 versus temperature are reported in the150-900 K temperature range for the lithium lanthanum titanateLi3xLa2/3-x□1/3-2xTiO3 perovskite-typefast-ionic conductors. The presence of Li+ ions of two kindswith slightly differing environments is displayed in theseexperiments. These ions exhibit two different motions: a fast onewith a characteristic frequency around 100 MHz at 350 K and a slowone whose frequency is around 60 kHz at 280 K. These two differentLi+ species cannot be differentiated by means of the fastmotion (only one T1 is observed from the experiments), but onlyby means of the slow ones (two T1ρ and two T2 areobserved). These motions are respectively attributed to Li+motion inside the A-cage of the perovskite structure formed by theoxygen ions and to Li+ hops between the cages. T1- andT1ρ-studies also performed on the 6Li nucleus clearlyshow that just dipolar nuclear interaction is responsible forLi+ relaxation. This result is at variance with what has beenpreviously put forward for the relaxation process in thesecompounds.
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