Ceramics-Silikáty 61, (4) 351 - 356 (2017) |
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MICROWAVE DIELECTRIC PROPERTIES AND CRYSTAL STRUCTURE OF CeO₂ DOPED (Na1/2Nd1/2)TiO₃ CERAMICS
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Tang Bin, Luo Xiaohui, Fang Zixuan, Zhou Lan, Zhang Shuren
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State Key Laboratory of Electronic Thin Films and Integrated Devices, University of electronic Science and Technology of China, Chengd, China
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Keywords: Microwave dielectric ceramics, CeO₂ , (Na1/2Nd1/2)TiO₃ , Perovskite structure
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The crystal structures and microwave dielectric properties of (Na1/2Nd1/2)TiO₃ (NNT) ceramics with x wt. % CeO₂ dopants (x = 0, 0.15, 0.3, 0.45) were investigated in this paper. X-ray diffraction (XRD) results showed that all the samples fitted well with a single perovskite structure phase in a Pm-3m space group. The lattice parameters increased because of the replacement of Ce4+ at the B-site. The change of dielectric constant (εr) was similar to that of ionic polarizabilities. The temperature coefficient of resonant frequency (τf) value of samples displayed a decreasing tendency with increasing x. The quality factor (Qxf) was found to have a maximum value of 8287 GHz at x = 0.3. As a result, when x = 0.3, the (Na1/2Nd1/2)TiO₃ ceramics sintered at 1300 °C for 2 h has good microwave dielectric properties of εr = 105.36, high Qxf = 8287 GHz, and τf = 246.3 ppm/ °C. |
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doi: 10.13168/cs.2017.0034
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