Abstract
Low-temperature co-fired Bi0.5Na0.5TiO3–SrTiO3 (BNT–ST)/Ag–Pd lead-free multilayer piezoactuators (MLAs) with a large strain and excellent cycling stability were fabricated by tape casting for practical applications. Adding CuO decreased the sintering temperature of (1 − x)BNT–xST + 0.05 wt% MnO2 (BNST100x) ceramics from 1190 °C to 960 °C. A BNST25.5 ceramic with 1.2 wt% CuO outputs a large normalized strain (950 pm/V) under an ultra-low driving field (2 kV/mm). Through optimizing the material composition and ceramic layer thickness, a normalized strain of 760 pm/V at 2.5 kV/mm is realized in a BNST24 with 1.2 wt% CuO MLA with a 63 μm single-layer thickness. Fairly good cycling stability is achieved with only ∼5% reduction after 107 cycles at 4 kV/mm. At the same time, these MLAs could still deliver over 85% strain at 80 °C. A MLA prototype with commercial size outputs a total strain of 0.112% and a blocking stress of 35.4 MPa at 2.5 kV/mm, demonstrating a better performance than that of traditional commercial lead zirconate titanate (PZT) actuators.
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Data Availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the Youth Innovation Promotion Association CAS (2021381).
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Funding was provided by the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2021381).
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XYT was responsible for conceptualization, investigation, and writing of the original draft. YTY and ZZD were responsible for writing, reviewing, & editing of the manuscript. MWS was responsible for test and data curation. JJZ was responsible for conceptualization, funding acquisition, and writing, reviewing, & editing of the manuscript. HL and CLG were responsible for funding acquisition and supervision.
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Tong, XY., Yang, YT., Du, ZZ. et al. Electromechanical properties and cycling stability of low-temperature co-fired BNT–ST multilayer piezoactuators. J Mater Sci: Mater Electron 33, 21482–21496 (2022). https://doi.org/10.1007/s10854-022-08939-7
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DOI: https://doi.org/10.1007/s10854-022-08939-7