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Enhancement of piezoelectric properties and temperature stability by forming an MPB in KNN-based lead-free ceramics

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Abstract

0.92(Na0.51K0.49−x Li x )NbO3–0.02Bi0.5K0.5TiO3–0.06BaZrO3 (x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) lead-free piezoelectric ceramics were prepared by solid state reaction route. The effect of Li doping amount on the structure and electrical properties of the ceramics were investigated. All ceramics had pure perovskite structure, while the crystallographic symmetry changed from rhombohedral to tetragonal with the increase of Li doping amount. A PZT-like morphotropic phase boundary (MPB) with the coexistence of rhombohedral and tetragonal phases was identified in the composition of x = 0.03. As expected, the ceramics of the MPB composition showed optimal properties: piezoelectric coefficient d 33 = 227 pC/N, planar electromechanical coupling coefficient k p = 39.3 %, dielectric permittivity \( \varepsilon_{33}^{T} /\varepsilon_{0} \) = 1,640, dielectric loss tanδ = 2.0 %, remnant polarization P r = 13.3 μC/cm2, coercive field E c = 1.53 kV/mm, and Curie temperature T c = 253 °C. Together with good temperature stability to 200 °C, this KNN-based lead-free ceramics should be very promising for practical applications.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Grant Nos. 51262011 and 51102121), Natural Science Foundation of Jiangxi Province of China (Grant No. 20114BAB206023), Jiangxi Science and Technology Support Plan (Grant No. 20132BBE50014), Jiangxi Major Scientific Leader Cultivation Plan (Grant No. 2010DD01100) and Science Foundation of Jiangxi Provincial Department of Education (Grant No. KJLD13076).

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Authors and Affiliations

  1. Jiangxi Key Laboratory of Advanced Ceramic Materials, School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, 333403, China

    Yue-Ming Li, Zong-Yang Shen, Fen Wu, Zhu-Mei Wang & Zu-Gui Xiao

  2. Kunshan Pant Piezoelectric Technology Company Ltd., Kunshan, 215300, China

    Tie-Zheng Pan & Zu-Gui Xiao

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  1. Yue-Ming Li
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  2. Zong-Yang Shen
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  3. Fen Wu
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  4. Tie-Zheng Pan
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  5. Zhu-Mei Wang
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  6. Zu-Gui Xiao
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Correspondence to Yue-Ming Li or Zong-Yang Shen.

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Li, YM., Shen, ZY., Wu, F. et al. Enhancement of piezoelectric properties and temperature stability by forming an MPB in KNN-based lead-free ceramics. J Mater Sci: Mater Electron 25, 1028–1032 (2014). https://doi.org/10.1007/s10854-013-1682-4

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