La_0.59Li_0.24TiO₃ ceramics obtained by spark plasma sintering: electric behavior analysis

This work describes the electric study of Lithium lanthanum titanate (La_0.59Li_0.24TiO₃) ceramics performed by Complex Impedance Spectroscopy. The nanoparticle powders have been synthesized through high energy ball milling and sintered via Spark Plasma Sintering technique. The experimental impedance data have been analyzed using the equivalent circuit model, the Extended Jonscher universal law and the derivative method. From these models, we have determined the dielectric response as well as the grain and grain boundary conductivity. The samples show ionic conductivity values between 10⁻⁵ to 10⁻⁴ S cm⁻¹ in the studied temperature range, and activation energy values 0.24 eV and 0.48 eV for grain and grain boundary, respectively. These results confirm the Li⁺ ions mobility through the crystalline structure of the material. (paper)