Preparation of Nano BaTiO 3 ‐Based Ceramics for Multilayer Ceramic Capacitor Application by Chemical Coating Method

The base‐metal‐electrode multilayer ceramic capacitors (BME MLCCs) for future application require much thinner dielectric layers (<1 μm). Therefore, the grain size and uniformity of BME MLCC powders should be effectively controlled. In this paper, the nanosized BME MLCC powders were prepared by chemical coating method. The well‐coated BaTiO 3 particles were obtained by adjusting an appropriate pH value. Transmission electron microscopy, energy‐dispersive spectroscopy, X‐ray photoelectron spectrum were utilized for the study of microstructures and element analysis. The high‐performance X7R dielectric ceramics were produced in reducing atmosphere by “two‐step” sintering method at a low temperature of 950°C. The dielectric constant at room temperature could reach ∼2400, with low dielectric loss below 1.0% and high insulation resistivity ∼10 12 Ω·cm. The ceramic grains were very homogenous with the average size below 150 nm.