Effect of annealing temperature on the Li+ ionic conductivity of La0.67−xLi3xTiO3

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Perovskite La0.67−xLi3xTiO3 with x = 0.10, 0.11, 0.12 and 0.13 were firstly annealed at 800 oC then treated by reactive milling, followed by post-annealing at temperatures from 1100 to 1200oC. The crystalline structure of grain and grain-boundary were characterized by XRD and SEM. The impedance measurements showed that nanocrystalline La0.67−xLi3xTiO3 after being annealed at 1150 oC possessed a grain conductivity as high as 1.3 × 10−3 S.cm−1 . The grainboundary conductivity was enhanced one order in magnitude after annealing at temperature higher 1100˚C and consists of 5.8 × 10−5 S.cm−1 . The results have also showed the limitation of the adiabatic thermal treatment for the improvement of the grain-boundary conductivity and suggested the way to overcome the limitation by rapidly cooling the samples from the high temperature to room temperature.

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