Microstructures and dielectric properties of Ba[(Co0.7Zn0.3)1/3Nb2/3]O3-based ceramics prepared by aqueous gelcasting-assisted solid-state method |
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| Authors: | Man Li Wenzhong Lu Wen Lei Xiaohong Wang Jiamin Wu |
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| Affiliation: | 1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China
2. Key Lab of Functional Materials for Electronic Information (B), MOE, Huazhong University of Science and Technology, Wuhan, 430074, China
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| Abstract: | The aqueous gelcasting-assisted solid-state method (AGAS) and traditional solid-state reaction method (TSSR) were used to prepare Ba[(Co0.7Zn0.3)1/3Nb2/3]O3 (BCZN)-based ceramics. The effects of different powder-preparation methods on the microstructures and dielectric properties of the BCZN-based ceramics were investigated. X-ray diffraction analysis showed completely the same phase compositions regardless of the preparation method adopted. The relative permittivity (ε r) did not significantly vary between the two methods. However, BCZN with CeO2-added ceramics prepared by AGAS had higher and more uniform density (6.374 g/cm3) and high quality factor of resonant frequency (Q × f) value (75,843 GHz) than those prepared by TSSR because of the more uniform microstructures, as shown by scanning electron microscopy images. The temperature coefficients of resonant frequency (τ f = 7.4 ppm/°C) of the ceramics prepared by AGAS were also closer to zero than those prepared by TSSR. |
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