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Structures and electrical properties of (Na0.5K0.5)NbO3–Li(Ta0.5Nb0.5)O3 lead-free piezoelectric ceramics

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Abstract

Solid solutions of (Na0.5K0.5)NbO3 (NKN) and Li(Ta0.5Nb0.5)O3 (LTN) were investigated as a potential candidate of lead-free piezoelectric ceramics. It was found that the Curie temperature of solid solutions increases slightly with increasing the LTN content and simultaneously the polymorphic phase transition temperature linearly decrease till below room temperature. An orthorhombic to tetragonal phase transformation at room temperature, or a morphotropic phase boundary, in NKN is induced by ~7 at% LTN addition, where the best dielectric, piezoelectric and electromechanical properties are achieved. The 0.94NKN–0.07LTN ceramics possess a dielectric constant of 765, a loss tangent of 0.04 at 1 kHz, a piezoelectric constant d33 of 253 pC/N and an electromechanical coupling factor kp of 48%.

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Acknowledgments

This work was financially supported by HFUT RenCai Foundation (No. 103-035006) and a special Program for Excellence Selection “R & D of Novel Lead Free Piezoelectric Ceramics” (No.103-035034), an open fund of State Key Laboratory of New Ceramics and Fine Processing and Nippon Sheet Glass Foundation for Materials Science and Engineering. This work is also partially supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. 9040982).

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Authors and Affiliations

  1. Institute of Electro Ceramics & Devices, School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, People’s Republic of China

    Ruzhong Zuo, Shi Su & Jian Fu

  2. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, People’s Republic of China

    Zhengkui Xu

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  1. Ruzhong Zuo
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  2. Shi Su
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Correspondence to Ruzhong Zuo.

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Zuo, R., Su, S., Fu, J. et al. Structures and electrical properties of (Na0.5K0.5)NbO3–Li(Ta0.5Nb0.5)O3 lead-free piezoelectric ceramics. J Mater Sci: Mater Electron 20, 469–472 (2009). https://doi.org/10.1007/s10854-008-9752-8

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  • DOI: https://doi.org/10.1007/s10854-008-9752-8

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