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Phase structure and electrical properties of lead-free (1 − 2x)NBT–xKBT–xBT ceramics

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Abstract

The research on Na0.5Bi0.5TiO3 based lead-free piezoelectric ceramics attracted widely attention during last decades. However, the electrical performance is still much inferior to that of lead-based counterparts, which limits its practical applications. Based on this situation, a ternary system of Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3–BaTiO3 [(1 − 2x)NBT–xKBT–xBT] is constructed in this work, hoping to further improve its piezoelectric response. The ceramics were fabricated by the traditional solid state reaction approach, and their structure and electrical performance were studied systematically. Excellent piezoelectric properties with d33 = 146 and kp = 26.5% were obtained at x = 0.08, which was supposed to be related with the coexistence of tetragonal and rhombohedral phases and appropriate grain size. Besides these, a relatively high dielectric constant (εr = 2250), a high remnant polarization (Pr = 31.5 µC/cm2) and low coercive field (Ec = 1.54 kV/mm) were also obtained at this composition. This work provides a new paradigm for the further optimization of NBT–KBT–BT based lead-free piezoelectric ceramics.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 50802066, 51072145, 51272191, 51372181, 51402005, 51672198), Innovative Public Service Platform Special Plan of Shandong (Grant No. 2014CXPT002), Primary Research Plan of Shandong Province (Grant No. 2016CYJS07A03-2), Instruction & Development Project for National Funding Innovation Demonstration Zone of Shandong Province (2016-181-11, 2017-41-1, 2017-41-3), and Central Guiding Local Science and Technology Development Special Funds (Grant No. 2060503).

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  1. Yang Li and Yong Zhang have contributed equally to this work.

Authors and Affiliations

  1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Yang Li, Yong Zhang, Huajun Sun, Dingguo Zhou & Qinghu Guo

  2. Advanced Ceramics Institute of Zibo New & High-Tech Industrial Development Zone, Zibo, 255000, People’s Republic of China

    Huajun Sun & Huiting Sui

  3. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Xiaofang Liu

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  1. Yang Li
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Correspondence to Xiaofang Liu.

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Li, Y., Zhang, Y., Sun, H. et al. Phase structure and electrical properties of lead-free (1 − 2x)NBT–xKBT–xBT ceramics. J Mater Sci: Mater Electron 29, 7851–7856 (2018). https://doi.org/10.1007/s10854-018-8784-y

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