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The effects of CuO-doping on dielectric and piezoelectric properties of Bi0.5Na0.5TiO3–Ba(Zr,Ti)O3 lead-free ceramics

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Abstract

CuO-doped lead-free ceramics based on bismuth sodium titanate (Bi0.5Na0.5TiO3, BNT) and barium zirconate titanate (Ba(Zr0.07Ti0.93)O3, BZT) were prepared via a multi-step solid-state reaction process. The BNT–BZT with CuO dopant ceramics sintered at 1150–1180 °C for 2 h in air showed a pure perovskite structure. SEM images reveal that a small amount of CuO (<2 mol%) play a significant role on the microstructure to improve its sintering attributes, while it will degrade when the dopant is added beyond 2 mol%. The dielectric and piezoelectric properties of CuO-doped BNT–BZT ceramics were evaluated. At room temperature, the sample doped with 2 mol% CuO shows quite good properties such as a high piezoelectric constant (d 33 ∼156.5 pC/N) and a high electromechanical coupling factor (k t ∼52%). The depolarization temperature increased dramatically and the maximum permittivity temperature decreased slightly.

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Acknowledgements

This work was supported by the Innovation and Technology Fund (ITF GHS/066/04) of the Hong Kong Polytechnic University.

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Authors and Affiliations

  1. Department of Applied Physics, Curtin University of Technology, GPO Box U 1987, Perth, 6845, WA, Australia

    H. Y. Tian & C. E. Buckley

  2. Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    H. Y. Tian, K. W. Kwok & H. L. W. Chan

Authors
  1. H. Y. Tian
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  2. K. W. Kwok
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  3. H. L. W. Chan
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  4. C. E. Buckley
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Correspondence to H. Y. Tian.

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Tian, H.Y., Kwok, K.W., Chan, H.L.W. et al. The effects of CuO-doping on dielectric and piezoelectric properties of Bi0.5Na0.5TiO3–Ba(Zr,Ti)O3 lead-free ceramics. J Mater Sci 42, 9750–9755 (2007). https://doi.org/10.1007/s10853-007-2005-z

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  • DOI: https://doi.org/10.1007/s10853-007-2005-z

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