Abstract
Donor-doped lead-free Bi0.7Ba0.3(Fe0.7Ti0.3)1−x Nb0.66x O3 + 1 mol% MnO2 ceramics were prepared by a conventional oxide-mixed method and the effects of Nb-doping on microstructure, piezoelectric and ferroelectric properties of the ceramics were investigated. All the ceramics exhibit a pure perovskite structure with rhombohedral symmetry. The grain growth of the ceramics is inhibited after the addition of Nb doping. High electric insulation (R = 109–1010 Ω⋅cm) and the poor piezoelectric performance and weak ferroelectricity are observed after the addition of Nb2O5 in the ceramics. Different from the donor effect of Pb-based perovskite ceramics, the introduction of Nb into 0.7BiFeO3–0.3BaTiO3 degrades the piezoelectricity and ferroelectricity of the ceramics. The Bi0.7Ba0.3(Fe0.7Ti0.3)1−x Nb0.66x O3 + 1 mol% MnO2 ceramic with x = 0 exhibits the optimum piezoelectric properties with d 33 = 133 pN C−1 and k p = 0.29 and high Curie temperature (TC = 603∘C).
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Acknowledgements
This work was supported by the projects of Education Department of Sichuan Province (11ZA104), Science and Technology Bureau of Sichuan Province (2010JQ0046) and the Open Project of State Key Laboratory of Electronic Thin Films and Integrated Devices of University of Electronic Science and Technology of China (KFJJ201108).
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WU, X., LUO, L., JIANG, N. et al. Effects of Nb doping on the microstructure, ferroelectric and piezoelectric properties of 0.7BiFeO3–0.3BaTiO3 lead-free ceramics. Bull Mater Sci 39, 737–742 (2016). https://doi.org/10.1007/s12034-016-1198-7
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DOI: https://doi.org/10.1007/s12034-016-1198-7