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Impedance spectroscopy and piezoelectric property of LiF-doped PZN–PZT low-temperature sintering piezoelectric ceramics

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Abstract

Low-temperature sintering piezoelectric ceramics of 0.3Pb(Zn1/3Nb2/3)O3–0.7Pb(Zr0.49Ti0.51)O3 with LiF and Sm2O3 additives were fabricated by a conventional solid-state reaction. In view of the possible defects caused by LiF do**, the as-sintered specimens were annealed in oxygen to enhance grain size and piezoelectric properties. X-ray diffraction revealed that Sm2O3 and LiF were dissolved in the lattices, forming a pure perovskite structure. Scanning electron microscopy showed that the grain size decreased with increased LiF amount. Hysteresis-loop studies indicated that increased LiF led to ferroelectricity deterioration. Impedance spectroscopy and activation-energy analyses revealed decreased oxygen vacancies after annealing in oxygen. Energy-dispersive spectrometry revealed that fluorine volatilized during annealing in oxygen. Thus, the decreased amounts of FO and VO were presumed responsible for the improved piezoelectric properties. Upon do** 1 mol% LiF, sintering temperature decreased from 1125 to 950 °C. Annealing in oxygen greatly improved the piezoelectric properties from d33 = 252 pC/N and Kp = 0.53 to d33 = 403 pC/N and Kp = 0.56, respectively.

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Acknowledgements

This work was supported by International Scientific and Technological Innovation Cooperation Key Projects for National Key R&D Program of China (No.2016YFE0203900), the national Nature Science Foundation of China through Grant (Nos.61201051), and the Fundamental Research Funds for the Central Universities of China (HUST: 2016JCTD114).

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Authors and Affiliations

  1. School of Optical and Electronic Information, Huazhong University of Technology, Wuhan, 430074, People’s Republic of China

    Ziqing Zeng, Qiuchen Wu, Mengmeng Hao, Wenzhong Lu & Guifen Fan

  2. Key Lab of Functional Materials for Electronic Information (B), MOE, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Ziqing Zeng, Qiuchen Wu, Mengmeng Hao, Wenzhong Lu & Guifen Fan

  3. College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Ming Yuchi & Mingyue Ding

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  1. Ziqing Zeng
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  2. Qiuchen Wu
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Correspondence to Guifen Fan.

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Zeng, Z., Wu, Q., Hao, M. et al. Impedance spectroscopy and piezoelectric property of LiF-doped PZN–PZT low-temperature sintering piezoelectric ceramics. J Mater Sci: Mater Electron 29, 8279–8286 (2018). https://doi.org/10.1007/s10854-018-8836-3

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