Effect of impurities on the electrical properties of the defect perovskite Li0.33La0.57TiO3

Abstract

A perovskite phase with the composition Li_0.33La_0.57TiO₃ modified with up to 7 wt % Bi₂O₃, SiO₂, Li₃PO₄, or Li₃BO₃ has been prepared by solid-state reactions. The samples in the LLTO–Li₃PO₄, LLTO–Bi₂O₃, and LLTO–SiO₂ systems were single-phase over the entire composition range studied. In the LLTO–Li₃BO₃ system, increasing the lithium borate concentration causes a transition from a defect perovskite structure to the layered perovskite-related structure of Li₂La₂Ti₃O₁₀. The addition of Bi₂O₃ and Li₃PO₄ has been shown to increase the total conductivity of the ceramics by almost one order of magnitude. Li₃BO₃, Li₃PO₄, Bi₂O₃, and SiO₂ additives improve the sintering behavior of the Li_0.33La_0.57TiO₃ ceramics.