Low temperature sintering and microwave dielectric properties of Zr0.3(Zn1/3Nb2/3)0.7TiO4 ceramics doped with CuO-B2O3
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The effects of CuO-B2O3 additive on sintering temperature and microwave dielectric properties of Zr0.3(Zn1/3Nb2/3)0.7TiO4 ceramics prepared by solid-state reaction method have been investigated. The phases and microstructure have also been evaluated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The pure Zr0.3(Zn1/3Nb2/3)0.7TiO4 ceramics show a high sintering temperature of about 1170 °C. However, the addition of CuO-B2O3 lowered the sintering temperature of Zr0.3(Zn1/3Nb2/3)0.7TiO4 ceramics from 1170 to 920 °C due to the CuO-B2O3 liquid-phase.The results showed that the microwave dielectric properties were strongly dependent on densification, crystalline phases and grain size. The Zr0.3(Zn1/3Nb2/3)0.7TiO4 ceramics with the addition of 4.0 wt.% CuO + 4.0 wt.% H3BO3 sintered at 920 °C afforded excellent dielectric properties of ε r = 45.8, Q×f =10918 GHz (at 4.5 GHz) and τ f = 45.6 ppm/°C, which represent very promising candidates for LTCC dielectric materials.
KeywordsCeramics Phases Zr0.3(Zn1/3Nb2/3)0.7TiO4 Dielectric properties
The authors acknowledge the generous support by the National Natural Science Foundation of China under grant no. 51202074 and the Fundamental Research Funds for the Central Universities under grant no. 2014XJGH005. The authors also wish to thank the Analytical and Testing Center of Huazhong University of Science and Technology.
- 2.O. Dernovsek, A. Naeini, G. Preu, W. Wersing, M. Eberstein, W.A. Schiller, J. Eur. Ceram. Soc. 21, 1963 (2011)Google Scholar
- 4.R. J. Cava., J. Mater. Chem. 54 (2001)Google Scholar
- 8.B. Tang, F. Luo, H. Chen, S. Yu, S. Zhang, J. Mater. Sci. 26, 7140 (2015)Google Scholar
- 14.B. W. Hakki, P. D. Coleman. IEEE Trans. Microw. Theory Tech. 420 (1960)Google Scholar
- 16.P. RiaziKhoei, F. Azough, R. Freer, J. Am. Ceram. Soc. 89, 216 (2006)Google Scholar
- 21.S.J. Perm, N.M. Alfor, A. Templeton, X. Wang, M. Xu, M. Reece, K. Schrapelt, J. Am. Ceram. Soc. 80, 1885 (1997)Google Scholar