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

概要

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Degradation behaviors of Mg-doped BaTiO3 have been studied in terms of oxygen vacancy concentration and microstructural development. Mg-doped BaTiO3 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 BaTiO3. With low levels of MgO (${<}1.0$ mol%), the microstructure is similar to that of undoped BaTiO3, whereas a significant reduction in grain size was observed with higher levels (${>}2.0$ mol%).
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-08-15