Effect of SiO2 addition on the dielectric properties and microstructure of BaTiO3-based ceramics in reducing sintering |
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| Authors: | Ying-chieh Lee Wei-hua Lu Chai-wei Lin |
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| Affiliation: | a Department of Material Engineering, Pingtung University of Technology & Science, China Taipei
b Electronic Ceramics Research Center, Yageo, Kaohsiung 811, China Taipei |
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| Abstract: | The effect of SiO2 doping on the sintering behavior, microstructure, and dielectric properties of BaTiO3-based ceramics has been investigated. Silica was added to the BaTiO3-based powder prepared by the solid state method with 0.075mol%, 0.15mol%, and 0.3mol%, respectively. The SiO2-doped BaTiO3-based ceramic with high density and uniform grain size were obtained, which were sintered in reducing atmosphere. A scanning electron microscope, X-ray diffraction, and LCR meter were used to determine the microstructure as well as the dielectric properties. SiO2 can form a liquid phase belonging to the ternary system of BaO-TiO2-SiO2, leading to the formation of BaTiO3 ceramics with high density at a lower sintering temperature. The SiO2-doped BaTiO3-based ceramics can be sintered to a theoretical density higher than 95% at 1220°C with a soaking time of 2 h. The dielectric constants of the sample with 0.15mol% SiO2 addition sintered at 1220°C is about 9000. Doping with a small amount of silica can improve the sintering and dielectric properties of BaTiO3-based ceramics. |
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| Keywords: | barium titanate multilayer ceramic capacitor (MLCC) reducing atmosphere dielectric properties |
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