Abstract
Lead-free ferroelectric ceramics (1 − x)[0.94Bi0.5Na0.5TiO3–0.06BaTiO3]–xBaZrO3(BNBT–xBZ, 0 ≤ x ≤ 0.05) were prepared by two-step sintering method, and the effects of BZ doping on phase structure, micro morphology and electromechanical strain were systematically investigated. The X-ray diffraction analysis reveals that the crystal structure transforms from a rhombohedral and tetragonal mixed phase to tetragonal phase with the increasing of BZ doping. The P–E loops and I–E loops demonstrate that the increase of BZ concentration destroys the ferroelectric order and brings about a phase transition from ferroelectric to antiferroelectric. BNBT–0.03BZ exhibits outstanding strain behavior featured by a high strain of 0.33% and a large d33 * of 600 pm/V at a moderate electric field of 55 kV/cm at room temperature with a relatively low unipolar strain hysteresis of 32.31%. With the increase of BZ, the value of strain decreases but the hysteresis also becomes lower. When the BZ amount is 0.05 mol%, the value of strain is 0.16% and the unipolar strain hysteresis is 11.30%.
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Acknowledgements
This work was supported by Major Program for the Natural Scientific Research of Jiangsu Higher Education Institutions (12KJA430002) and Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions. And the authors acknowledge the financial support from Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), IRT1146.
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Zhang, X., Liu, Y., Yu, Z. et al. Phase transition and huge field-induced strain of BaZrO3 modified (Bi0.5Na0.5)0.94Ba0.06TiO3 ceramics. J Mater Sci: Mater Electron 28, 14664–14671 (2017). https://doi.org/10.1007/s10854-017-7331-6
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DOI: https://doi.org/10.1007/s10854-017-7331-6