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BiFeO3-modified (Li, K, Na)(Nb, Ta)O3 lead-free piezoelectric ceramics with temperature-stable piezoelectric property and enhanced mechanical strength

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Abstract

BiFeO3-modified lead-free piezoceramics Li0.05(Na0.515K0.485)0.95Nb0.8Ta0.2O3 (LKNNT) were successfully fabricated by conventional method to investigate its influences on phase structure and electricity as well as mechanical properties. A tiny amount of BiFeO3 (BF) changes the phase structure of LKNNT to tetragonal and further to pseudocubic, and also effectively improves the sintering ability and densification of LKNNT which enhances the mechanical property. The LKNNT piezoceramics with the addition of 1 mol% BF has the bulk density of 5.02 g/cm3 and an enhanced fracture strength of 142 MPa which is even higher than that of the sample of similar composition prepared by spark plasma sintering, also possesses room temperature electric properties of d 33* ~ 225 pm/V, k p ~ 36.3%, ε r ~ 1140, tgδ ~ 0.018, T c ~ 305 °C and Q m ~ 80. The d 33* remains constant up to 150 °C and the change ratio of dielectric property largely decreases over the temperature range of −50–150 °C, which can be attributed to the temperature-independent phase structure of LKNNT piezoceramics, making the ceramics as a promising candidate for actual applications.

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Acknowledgements

This work was supported by the Tsinghua University Initiative Scientific Research Program and the Ministry of Science and Technology of China under the Grant 2009CB623304, as well as by National Nature Science Foundation of China (Grant Nos. 50921061 and 51028202).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, China

    Jia-Jun Zhou, Jing-Feng Li & Xiao-Wen Zhang

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  1. Jia-Jun Zhou
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  2. Jing-Feng Li
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  3. Xiao-Wen Zhang
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Correspondence to Jing-Feng Li.

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Zhou, JJ., Li, JF. & Zhang, XW. BiFeO3-modified (Li, K, Na)(Nb, Ta)O3 lead-free piezoelectric ceramics with temperature-stable piezoelectric property and enhanced mechanical strength. J Mater Sci 47, 1767–1773 (2012). https://doi.org/10.1007/s10853-011-5957-y

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  • DOI: https://doi.org/10.1007/s10853-011-5957-y

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