Abstract
A series of barium zirconate modified potassium sodium niobate-based lead-free piezoelectric ceramics [(0.97-x)(K0.45Na0.55)(Nb0.97Sb0.03)O3-0.03Bi0.5K0.075Na0.425ZrO3-xBaZrO3, KNNS–BKNZ–xBZ, x = 0 ~ 0.02] were prepared by the traditional solid-state method. The effect of BZ on the phase structure and electrical properties was systematically studied. Rhombohedral–orthorhombic–tetragonal multiphase coexistence structure can be observed for the whole ceramic system while the addition of BZ leads to the reduction in the orthorhombic phase content and increase in the rhombohedral and tetragonal phase content. At the critical composition with x = 0.01, the ceramics show the optimized electrical properties with the piezoelectric constant d33 of 265 pC/N, unipolar strain Suni of 0.168%, inverse piezoelectric coefficient d33* of 480 pm/V, room-temperature dielectric constant εr of 1634, and Curie temperature TC of 282 °C. Moreover, enhanced temperature stability was achieved in the x = 0.01 ceramics, presenting the variation of d33 less than 15% within the temperature range of 20–100 °C and the Suni remained above 80% until the elevated temperature of 175 °C.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (Grant No. 2022YFB3807404); National Natural Science Foundation of China (Grant No. 52172134). The authors would like to acknowledge the financial support from State Key Laboratory of Powder Metallurgy.
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ZD contributed to the writing—original draft, methodology, investigation, and formal analysis; XZ was involved in the writing—review and editing; YZ assisted in the writing—review and editing, supervision, project administration, and funding acquisition; DZ contributed to the project administration and funding acquisition.
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Dai, Z., Zhou, X., Zhang, Y. et al. Temperature-insensitive electrical performance of the potassium sodium niobate-based ceramics modified by barium zirconate. J Mater Sci 59, 950–963 (2024). https://doi.org/10.1007/s10853-023-09270-0
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DOI: https://doi.org/10.1007/s10853-023-09270-0