The properties of Al 2 O 3 coated fine‐grain temperature stable BaTiO 3 ‐based ceramics sintered in reducing atmosphere

Abstract Chemical coating, an effective doping modification method, was employed to fabricate fine‐grain BaTiO 3 ‐based ceramics. Based on the consideration of subsequently using base metal as inner electrodes in multilayer ceramic devices, green bodies are generally sintered in reducing atmosphere, which generates more charged point defects and thus affects the electric properties. According to the elements distribution analysis, Al element is greatly enriched in the grain boundary and shell region. Coating Al 2 O 3 achieves not only a smaller grain size and narrower distribution but also a higher breakdown strength, discharge energy density and energy efficiency at ambient temperature. In addition, temperature dependences of dielectric and energy storage properties under a same field were also investigated. Over the whole measuring temperature range, the sample with Al 2 O 3 remains higher discharge energy density and energy efficiency.