Abstract
The increasing necessity of high ionic conductor for solid state electrolytes implies the enhancement of our understanding in the relationship between doping-microstructure-ionic conductivity. In the current study, Li0.5La0.5-xCexTiO3 (0.00 ≤x ≤ 0.05) perovskites are obtained using the sol-gel method to evaluate the effects of cerium doping on microstructure and conductivity. The results confirms that all samples present a tetragonal perovskite structure with the lowest energy gap of 1.67eV for x = 0.01 of Ce3+, this particular composition present an average grain size of 2.026 μm and the highest relative density (92.02 %), bulk and grain boundary conductivities in the order of 1.949 × 10−3 S/cm and 1.671 × 10−6 S/cm, respectively at room temperature. These conductivity values are approximately an order of magnitude higher than the Ce-free material, thanks to the optimized relative density and adequate grain size.
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