Microstructures and dielectric properties of Ba0.6Sr0.4TiO3-MgO ceramics prepared by non-aqueous gelcasting and dry pressing |
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Authors: | Jia-Min Wu Yue-Nong Fan Wen-Zhong Lu |
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Affiliation: | a Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China b Department of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China |
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Abstract: | Non-aqueous gelcasting and dry pressing were used to prepare 45 wt% Ba0.6Sr0.4TiO3-55 wt% MgO (BSTM) ceramics. The effects of different forming methods on the microstructures and dielectric properties of the BSTM ceramics were investigated. The densities of the BSTM ceramics prepared by non-aqueous gelcasting are lower but more uniform than that of the BSTM ceramics prepared by dry pressing. The XRD analysis illustrates that phase compositions are completely the same no matter what forming method is adopted. The SEM results show that the BSTM green samples and sintered ceramics prepared by non-aqueous gelcasting are more uniform than that prepared by dry pressing. Furthermore, it is found that the BSTM ceramics prepared by non-aqueous gelcasting have higher and more uniform dielectric constant, tunability and loss tangent (measured at 10 kHz and 20 °C). Meanwhile, the BSTM ceramics prepared by non-aqueous gelcasting have higher dielectric constant and lower Q × f value (namely more loss) when they are measured at microwave frequencies. |
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Keywords: | A Ceramics D Dielectric properties D Microstructure |
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