Abstract
It is well known that there is a pinning effect of oxygen vacancies. The migration rate of an oxygen vacancy in crystalline ceramics is lower than the rate of spontaneous polarization, which limits the improvement of piezoelectric properties. In this work, Pr and Ce elements were introduced into position A of Na0.5Bi4.5Ti4O15 to improve the piezoelectric properties of Na0.5Bi4.2-xCexPr0.3Ti4Oy ceramics. The Ce-doping effectively modulated the content of oxygen vacancies by different doping amounts so that the difficulty of domain inversion caused by oxygen vacancy motion was reduced and insufficient polarization was improved. As a result, the best piezoelectric properties (d33 = 22 pC/N) and low dielectric loss (tan δ = 0.003) were achieved at 10 KHz under 200°C with a substitution of 0.025 mol in Na0.5Bi4.2-xCexPr0.3Ti4Oy ceramics. The high dielectric constants and low dielectric loss greatly improve the energy conversion efficiency, so this ceramic has great prospects in the application of medium- and high-frequency ultrasonic transducers.
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Acknowledgments
This work was supported by the National Science Foundation of China (Grant Nos. 52272107, 52102128) and the Key Research Development Program of Wuhan (Grant No. 2022012202015055).
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Niu, H., Fan, D., Mo, W. et al. Excellent Piezoelectric Properties of NBT-Based Lead-Free Ceramics Through Regulation of Oxygen Vacancies. J. Electron. Mater. 52, 7280–7289 (2023). https://doi.org/10.1007/s11664-023-10626-0
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DOI: https://doi.org/10.1007/s11664-023-10626-0