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Lead-free Na0.5K0.5NbO3 piezoelectric ceramics fabricated by spark plasma sintering: Annealing effect on electrical properties

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Abstract

Niobate ceramics such as NaNbO3 and KNbO3 have been studied as promising Pb-free piezoelectric ceramics, but their sintering densification is fairly difficult. In the present study, highly dense Na0.5K0.5NbO3 ceramics with submicron grains were prepared using SPS, whose density was raised to 4.47 g/cm3 (>99% of the theoretical density) at 920 °C. Reasonably good ferroelectric and piezoelectric properties were obtained in the SPSed Na0.5K0.5NbO3 ceramics after annealing in air. The effect of annealing time on the electrical properties was investigated to determine optimal processing condition. The piezoelectric parameter (d 33) of the Na0.5K0.5NbO3 ceramics annealed properly reached 148 pC/N.

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Acknowledgments

The authors wish to thank Toyota Motor Corporation for their support to Tsinghua-Toyota collaborative research on lead-free piezoelectric ceramics. This work was also partly supported by the National Natural Science Foundation of China (Grant No. 50325207) and the Ministry of Science and Technology (Grant No. 2002CB613306).

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    Ke Wang & Jing-Feng Li

  2. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Ke Wang, Bo-Ping Zhang & Li-Min Zhang

Authors
  1. Ke Wang
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  2. Bo-Ping Zhang
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  3. Jing-Feng Li
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  4. Li-Min Zhang
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Correspondence to Jing-Feng Li.

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Wang, K., Zhang, BP., Li, JF. et al. Lead-free Na0.5K0.5NbO3 piezoelectric ceramics fabricated by spark plasma sintering: Annealing effect on electrical properties. J Electroceram 21, 251–254 (2008). https://doi.org/10.1007/s10832-007-9137-z

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  • DOI: https://doi.org/10.1007/s10832-007-9137-z

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