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Ferroelectric and piezoelectric properties of new NaNbO3–Bi0.5K0.5TiO3 lead-free ceramics

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Abstract

New lead-free ceramics (1–x)NaNbO3–xBi0.5K0.5TiO3 have been fabricated by the conventional ceramic sintering technique, and their ferroelectric and piezoelectric properties have been studied. The results of X-ray diffraction reveal that Bi0.5K0.5TiO3 diffuses into the NaNbO3 lattices to form a new perovskite-type solid solution with orthorhombic symmetry. The addition of a small amount of Bi0.5K0.5TiO3 (x ≥ 0.025) transforms the ceramics from antiferroelectric to ferroelectric. The ceramic with x = 0.10 possesses the largest remanent polarization P r and thus exhibits the optimum piezoelectric properties, giving d 33 = 71 pC/N, k p = 16.6% and k t = 39.7%. The ceramics with low doping level of Bi0.5K0.5TiO3 are normal ferroelectrics and the ferroelectric-paraelectric phase transition becomes diffusive gradually with the doping level x of Bi0.5K0.5TiO3 increasing. Our results show the (1–x)NaNbO3–xBi0.5K0.5TiO3 ceramics is one of the good candidates for lead-free piezoelectric and ferroelectric materials.

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Acknowledgments

This work was supported by the projects of Education Department of Sichuan Province (08ZA047), and Science and Technology Bureau of Sichuan Province (09ZQ026-059).

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Authors and Affiliations

  1. Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, and College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, People’s Republic of China

    Dunmin Lin

  2. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, People’s Republic of China

    K. W. Kwok

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  1. Dunmin Lin
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  2. K. W. Kwok
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Correspondence to Dunmin Lin.

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Lin, D., Kwok, K.W. Ferroelectric and piezoelectric properties of new NaNbO3–Bi0.5K0.5TiO3 lead-free ceramics. J Mater Sci: Mater Electron 21, 1060–1065 (2010). https://doi.org/10.1007/s10854-009-9998-9

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  • DOI: https://doi.org/10.1007/s10854-009-9998-9

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