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Microstructure, dielectric and piezoelectric properties of lead-free Bi 0·5 Na 0·5 TiO 3  −Bi 0·5 K 0·5 TiO 3  −BiMnO 3 ceramics

Abstract

To improve the piezoelectric properties of Bi 0·5Na 0·5TiO 3-based ceramics, a new perovskite-type lead-free piezoelectric (1 –  x –  y)Bi 0·5Na 0·5TiO 3 −xBi 0·5K 0·5TiO 3 −yBiMnO 3 system has been fabricated by a conventional solid–state reaction method and their microstructure, dielectric and piezoelectric properties have been investigated. The results of X-ray diffraction (XRD) analysis reveal that the addition of small amounts of BiMnO 3 did not cause a remarkable change in crystal structure, but resulted in an evident evolution in microstructure. An obvious secondary phase was observed in samples with high Bi 0·5K 0·5TiO 3 content. It is found from dielectric constant curves that low-temperature hump disappeared with increasing y and it appeared again with increasing x. The piezoelectric properties significantly increase with increasing Bi0·5K0·5TiO3 and BiMnO 3 content. The piezoelectric constant and electromechanical coupling factor attain maximum values of d 33 = 182 pC/N at x = 0·21(y = 0·01) and k p = 0·333 at x = 0·18 (y = 0·01), respectively.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China (61261012), Guangxi Science Foundation (2010GXNSFD013007 and 2010GXNSFB013010) and Guangxi Education Department Foundation (201012MS083).

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Correspondence to HUABIN YANG.

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YANG, H., SHAN, X., ZHOU, C. et al. Microstructure, dielectric and piezoelectric properties of lead-free Bi 0·5 Na 0·5 TiO 3  −Bi 0·5 K 0·5 TiO 3  −BiMnO 3 ceramics. Bull Mater Sci 36, 265–270 (2013). https://doi.org/10.1007/s12034-013-0451-6

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  • DOI: https://doi.org/10.1007/s12034-013-0451-6

Keywords

  • Piezoelectricity
  • perovskites
  • electroceramic
  • electrical properties