Dielectric properties of La2Ti2O7 ceramics

Abstract

La2Ti2O7 ceramics prepared by solid state reaction method have been studied for their structural and dielectric properties. At room temperature (25 °C), La2Ti2O7 ceramics exhibit intrinsic dielectric response with a dielectric constant ∼ 41 and dielectric loss ∼10−2 at f = 1 MHz. Impedance spectroscopy in the frequency range 1Hz to 1 MHz reveals grain and grain boundary effects with estimated grain resistances (Rg ∼ 1.01⨉106 Ω) and grain boundary resistance (Rgb ∼ 5.4⨉106 Ω). The room temperature dc resistivity is estimated to be 5.615⨉107 Ω cm for La2Ti2O7 ceramics sintered at 1200 °C for 24 hours.