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Effect of sintering parameters on the microstructure and microwave dielectric properties of Ba(Zn1/3Nb2/3)O3–ZnNb2O6 Ceramics

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Abstract

Ba(Zn1/3Nb2/3)O3–ZnNb2O6(BZNZ) composite ceramics were fabricated by conventional solid solution processing. After optimizing the composition, the effects of the sintering parameters, such as the heating rate, the soaking time, and the cooling rate on densities, microstructure, and microwave dielectric properties were investigated using orthogonal experimental design method. The results show that with increasing the content of Ba(Zn1/3Nb2/3)O3, the ε r increases, while the Q × f value increases first, then decreases, and τ f shifts to the negative value. The BZNZ ceramics with composition of 0.3Ba(Zn1/3Nb2/3)O3–0.7ZnNb2O6 show the optimal dielectric properties. The results of orthogonal experimental design show that sintering parameters play an important role in the microstructure and dielectric properties. The ceramics show obvious duplex-grain structure. The importance sequence of the sintering parameters is: cooling rate > heating rate > soaking time. The sintering parameters were optimized, with 0.3Ba(Zn1/3Nb2/3)O3–0.7ZnNb2O6 ceramic sintered at a heating rate of 2 °C/min, soaking time of 8 h, and cooling in the air. Samples have the excellent dielectric properties: εr = 32.75, Q × f = 34,100, and τ f  = −10.2 ppm/°C.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China, Aviation Science Foundation of China, Industrial Technology Research Foundation of Shaanxi Province, and Basic Research Foundation of Northwestern Polytechnical University.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, College of Material Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Zhiqiang Li, Feng Gao, GuoXin Hu & Dashuai Zhang

  2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Yong Zhang & Huajun Sun

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  1. Zhiqiang Li
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  2. Feng Gao
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  3. GuoXin Hu
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  4. Dashuai Zhang
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Correspondence to Feng Gao or Huajun Sun.

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Li, Z., Gao, F., Hu, G. et al. Effect of sintering parameters on the microstructure and microwave dielectric properties of Ba(Zn1/3Nb2/3)O3–ZnNb2O6 Ceramics. J Mater Sci: Mater Electron 25, 5020–5026 (2014). https://doi.org/10.1007/s10854-014-2266-7

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  • DOI: https://doi.org/10.1007/s10854-014-2266-7

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