The effect of multivalent ions on BaTiO3-based ceramics with non-reducibility

Novel MnO2-doped BaTiO3 (BT) ceramics with non-reducibility are synthesized by conventional solidstate route. The effects of MnO2-doped and sintering atmosphere on dielectric properties, microstructure, phase structure and defect structure are systematically investigated. EPR results indicate that manganese exists in the form of +2 valence, which keeps BT ceramics with excellent dielectric properties even sintered in reducing atmosphere. With 0.2 mol% MnO2 doped, the sample sintered in H-2-N-2 exhibits high dielectric constant (2700@1 kHz), low loss tangent (0.98%@1kHz) and excellent insulation resistivity (8.68 x 10(11)Omega.cm), supplying an effective method for the preparation of non-reducible MLCC materials by introducing multivalent ions. (C) 2019 Elsevier B.V. All rights reserved.