ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 61, (4) 351 - 356 (2017)


MICROWAVE DIELECTRIC PROPERTIES AND CRYSTAL STRUCTURE OF CeO₂ DOPED (Na1/2Nd1/2)TiO₃ CERAMICS
 
Tang Bin, Luo Xiaohui, Fang Zixuan, Zhou Lan, Zhang Shuren
 
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of electronic Science and Technology of China, Chengd, China

Keywords: Microwave dielectric ceramics, CeO₂ , (Na1/2Nd1/2)TiO₃ , Perovskite structure
 

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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