Abstract
In this work, composition-insensitive enhanced piezoelectric properties are achieved in (1-x)(K0.48Na0.52)0.96Li0.04(Nb0.96Sb0.04)O3-xSrZrO3 (KNN-SZ) lead-free ceramics. Rietveld refinements of the XRD patterns show that the introduction of SrZrO3 straightens the O-B-O bond, leading to a relatively broad compositional region from x = 0.04 to 0.06 for the coexistence of orthorhombic-tetragonal (O-T) phase at room temperature. Within the phase coexistence region, relatively large and composition insensitive piezoelectric properties d33 = 250 ~ 256 pC/N and kp = 0.42 ~ 0.46, as well as low dielectric loss tan δ = 0.026 ~ 0.028 are attained in the KNN-SZ ceramics. The composition insensitivity of piezoelectric properties benefits from the enlarged εr and decreased Pr, which are originated from facilitated polarization rotation in the phase boundary region and normal ferroelectric-to-relaxor transition, respectively. Furthermore, an ultrahigh electric-field induced strain S = 0.195% is obtained, compared with reported KNN-based lead-free ceramics.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 51572205), the Equipment Pre-Research Joint Fund of EDD and MOE (No. 6141A02022262), the open project of Engineering Research Center of Nano-Geo Materials of Ministry of Education (NGM2019KF005), the Fundamental Research Funds for the Central Universities (WUT: 2017III035, 2018III019).
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Zhou, J., Xiang, G., Shen, J. et al. Composition-insensitive enhanced piezoelectric properties in SrZrO3 modified (K, Na)NbO3-based lead-free ceramics. J Electroceram 44, 95–103 (2020). https://doi.org/10.1007/s10832-019-00195-2
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DOI: https://doi.org/10.1007/s10832-019-00195-2