Abstract
Lead-free and high-temperature piezoelectric ceramics of xBiFeO3–(1 − x)BaTiO3-1.0 mol% MnO2 (0.67 ≤ x ≤ 0.78) (xBF–(1 − x)BT-Mn) were fabricated by the conventional solid-state reaction method, and their high-temperature dielectric, piezoelectric and ferroelectric properties near the morphotropic phase boundary were studied systematically. XRD analysis revealed that xBF–(1 − x)BT-Mn ceramics exhibited pure perovskite structure, and the phase was driven by composition variation from the pseudo-cubic (0.67 ≤ x < 0.70) to rhombohedral (0.70 ≤ x ≤ 0.78). The dielectric constant ε r (1 kHz), dielectric loss tanδ (1 kHz), Curie temperature T C, depolarization temperature T d, piezoelectric constant d 33, remnant polarization P r (60 kV/cm) and room temperature planar electromechanical coupling factor k p of xBF–(1 − x)BT-Mn ceramics of x = 0.70 were 740, 0.045, 487, 430 °C, 35.5 μC/cm2, 177 pC/N and 0.37, respectively. The unipolar strain and high field strain coefficient d *33 of xBF–(1 − x)BT-Mn ceramics with x = 0.70 increased up to 0.26% and 652 pm/V at 180 °C. Temperature dependence of ε r, tanδ and k p of xBF–(1 − x)BT-Mn ceramics with x = 0.75 was stable from room temperature even up to 500 °C. These results indicated that xBF–(1 − x)BT-Mn ceramics were promising candidates for high-temperature lead-free piezoelectric applications.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51302163, 51672169).
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Wei, J., Fu, D., Cheng, J. et al. Temperature dependence of the dielectric and piezoelectric properties of xBiFeO3–(1 − x)BaTiO3 ceramics near the morphotropic phase boundary. J Mater Sci 52, 10726–10737 (2017). https://doi.org/10.1007/s10853-017-1280-6
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DOI: https://doi.org/10.1007/s10853-017-1280-6