Abstract
Lead-free (1−x)K0.5Na0.5NbO3-x mol%Sr2MnSbO6 (abbreviated as KNN–xSMS, x = 0, 1 and 2) piezoelectric ceramics were prepared using the conventional solid-state sintering method. The effects of SMS on the microstructure and electrical properties of the KNN ceramics are investigated. 1 mol% SMS can greatly enhance the densification and increase the piezoelectric properties. Higher do** amounts will decrease the grain size and reduce electrical properties. The x = 0 and 1 samples show normal ferroelectric phase transition behavior, while the x = 2 sample exhibits diffuse phase transition behavior. Besides, after do** 1 mol% SMS, the field-induced unipolar strain and the remnant polarization vary less than undoped KNN ceramics in the temperature range of 30–160 °C. Therefore, do** SMS is an effective way to promote the temperature stability and electrical properties of KNN piezoelectric materials.
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Acknowledgements
This work was supported by the Natural Science Foundation of Shandong Province of China (Grant Nos. ZR2018MEM011, ZR201709250374, ZR2017MEM019 and ZR2016EMM02), the National Key R&D Program of China (Grant No. 2016YFB0402701), the Key R & D project of Shandong Province (Grant No. 2017GGX202008) and the Project of Shandong Province Higher Educational Science and Technology Program (Grant No. J17KA005).
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Shi, W., Du, J., Chen, C. et al. Dielectric relaxation, impedance spectra, temperature stability and electrical properties of Sr2MnSbO6-modified KNN ceramics. J Mater Sci: Mater Electron 31, 959–966 (2020). https://doi.org/10.1007/s10854-019-02606-0
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DOI: https://doi.org/10.1007/s10854-019-02606-0