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Phase Structure, Microstructure and Electrical Properties of KxNa(1-x)NbO3 Piezoelectric Ceramics with Different K/Na Ratio

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Abstract

The KxNa(1-x)NbO3 (x = 0.45, 0.46, 0.47, 0.48, 0.49, 0.50) lead-free piezoelectric ceramics was fabricated by conventional solid-state sintering method. It was found that the ratio of alkaline metal would affect the microstructure, bulk density, and optimum sintering temperatures of ceramics. Meanwhile, the electrical properties were also influenced by modulating the K/Na ratio, exhibiting corresponding composition-dependent properties. The optimum electrical properties of KxNa(1-x)NbO3 such as piezoelectric constant d33 = 115 pC/N, mechanical quality factor Qm = 20, Curie temperature Tc = 365 °C, εT33/ε0= 588.1, dielectric loss tan δ = 0.024, bulk density (ρ) = 3.08 g/cm3, remnant polarization (Pr) = 8.87 μC/cm2 and coercive field (Ec) = 13.79 kV/cm were obtained at x = 0.46.

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Authors and Affiliations

  1. Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Material Science and Engineering, Wuhan Institute of Technology, Wuhan, 430074, China

    Jianchao Chen  (陈建超), Wei Wu, Shi Su & Pei Zhao  (赵培)

  2. Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, China

    Jianchao Chen  (陈建超) & Xinrong Lei

  3. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

    Jishun Yu

Authors
  1. Jianchao Chen  (陈建超)
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  2. Wei Wu
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  3. Shi Su
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  4. Jishun Yu
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  5. Xinrong Lei
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  6. Pei Zhao  (赵培)
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Corresponding author

Correspondence to Pei Zhao  (赵培).

Additional information

Funded by the National Natural Science Foundation of China (No. 51302199), Key Natural Science Foundation of Hubei Province of China for Distinguished Yong Scholars (No. 2014CFA044) and Cultivation Plan for Science and Technology Talents of WuHan City (No. 2014072704011253), and by MOST Special Fund from the State Key Laboratory of Geological Process and Mineral Resources (No.MSFGPMR201204), and Natural Science Foundation of Hubei Province (No.2014CFB809)

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Chen, J., Wu, W., Su, S. et al. Phase Structure, Microstructure and Electrical Properties of KxNa(1-x)NbO3 Piezoelectric Ceramics with Different K/Na Ratio. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 34, 30–34 (2019). https://doi.org/10.1007/s11595-019-2010-5

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  • DOI: https://doi.org/10.1007/s11595-019-2010-5

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