Effects of MgO-Doping on Electrical Properties and Microstructure of BaTiO₃

Abstract

Degradation behaviors of Mg-doped BaTiO 3 have been studied in terms of oxygen vacancy concentration and microstructural development. Mg-doped BaTiO 3 powders were precisely synthesized by the Pechini method. As MgO content was increased to 1.0 mol%, Curie points moved to lower temperatures and dielectric constants decreased. The specimens doped with MgO showed higher leakage currents under the continuously applied dc field at a high temperature (100°C) during the aging process, compared with the undoped BaTiO 3 . With low levels of MgO (<1.0 mol%), the microstructure is similar to that of undoped BaTiO 3 , whereas a significant reduction in grain size was observed with higher levels (>2.0 mol%).