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Perovskite La(2/3)−xLi3xTiO3 samples with 0.06 6 x 6 0.15 were prepared by a double mechanical alloying method. Structure and Li+-ion conductive properties of the La(2/3)−xLi3xTiO3 samples were investigated. Most of the analyzed perovskite samples exhibit a double unit cell. In these samples, a change of symmetry from tetragonal to orthorhombic is observed for sample with lithium content x = 0.06. Structural modifications were obtained mainly due to the cation vacancies ordering along the c-axis, which disappeared gradually when the lithium content increased. At room temperature, the maximum values of grains and grain boundaries conductivities of the La(2/3)−xLi3xTiO3 samples were found to be of 1.5×10−3 S/cm and 5.8×10−5 S/cm, respectively. The temperature dependence of ionic conductivity obeyed a non-Arrhenius behaviour. At temperature from 30 to 125 oC, the activation energy for grain and grain-boundary conductivity was found to be of ∼ 0.23 eV and ∼ 0.32 eV, respectively.

communications in physics/communications in physics

Influence of Lithium Content on the Structure and Ionic Conductivity of Perovskite \(\mbox{La}_{(2/3) - x}\mbox{Li}_{3x}\mbox{TiO}_{3}\) Made by Double Mechanical Alloying Method