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Dielectric and Piezoelectric Properties of Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-NaNbO3Lead-Free Ceramics

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Abstract

The ternary lead-free piezoelectric ceramics system of (1 − x) [0.88Na0.5Bi0.5TiO3-0.12K0.5Bi0.5TiO3] − xNaNbO3(x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by conventional solid state reaction method. The crystal structure, dielectric, piezoelectric properties and P-E hysteresis loops were investigated. The crystalline structure of all compositions is mono-perovskite phase ascertained by XRD, and the lattice constant was calculated from the XRD data. Temperature dependence of dielectric constant ε r and dissipation factor tan δ measurement revealed that all compositions experienced two phase transitions: from ferroelectric to anti-ferroelectric and from anti-ferroelectric to paraelectric, and these two phase transitions have relaxor characteristics. Both transition temperatures Td and Tm are lowered due to introduction of NaNbO3. P-E hysteresis loops show that 0.88Na0.5Bi0.5TiO3-0.12K0.5Bi0.5TiO3 ceramics has the maximum Pr and E c corresponding to the maximum values of electromechanical coupling factor Kp and piezoelectric constant d33. The piezoelectric constant d33 and electromechanical coupling factor Kp decrease a little, while the dielectric constant ε33T/ε0 improves much more when the concentration of NaNbO3 is 8 mol%.

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Authors and Affiliations

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

    Yue-Ming Li, Wen Chen, Qing Xu, Jing Zhou, Hua-Jun Sun & Mei-Song Liao

  2. Jingdezhen Ceramic Institute, Jingdezhen, 333001, Jiangxi, People’s Republic of China

    Yue-Ming Li

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  1. Yue-Ming Li
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  2. Wen Chen
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  3. Qing Xu
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  4. Jing Zhou
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  5. Hua-Jun Sun
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  6. Mei-Song Liao
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Correspondence to Wen Chen.

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Li, YM., Chen, W., Xu, Q. et al. Dielectric and Piezoelectric Properties of Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-NaNbO3Lead-Free Ceramics. J Electroceram 14, 53–58 (2005). https://doi.org/10.1007/s10832-005-6584-2

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  • DOI: https://doi.org/10.1007/s10832-005-6584-2

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