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Phase boundary design and enhanced electrical properties in (Bi0.5Li0.45Ag0.05)(Zr0.98Hf0.02)O3-modified KNN-based lead-free piezoceramic

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Abstract

For fabricating (K, Na)NbO3-based ceramic, the improved piezoelectric properties can be obtained through phase boundary design. Herein, the (1 − x)K0.48Na0.52Nb0.96Sb0.04O3–x(Bi0.5Li0.45Ag0.05)(Zr0.98Hf0.02)O3 lead-free ceramics with rhombohedral-tetragonal (R-T) phase boundary was designed and developed by the conventional pressureless sintering. The relationship between phase structure, surface morphology and electrical properties was systematically investigated. According to phase diagram from XRD and dielectric-temperature measurements, the ceramics exhibit the R-T phase coexistence in the range of 0.035 ≤ x ≤ 0.05. As a result, the optimal comprehensive properties (d33 ~ 343 pC/N, d33* ~ 410 pm/V, TC ~ 270 °C) were achieved in the ceramic with x = 0.035, due to the coexistence of R-T phase caused free energy flatten and energy barrier reduce. These results indicate that the construction of R-T phase coexistence is an effective strategy to improve the electrical properties of KNN-based ceramics.

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Acknowledgements

This work was partially funded by the Science and Technology Development Plan Project of Shandong Province, China (Grant no. 2013GSF11714).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong Province, China

    Bo He, Yi Du, Jiajia Wang, Weipeng Liu & Huixiang Xu

  2. School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, 150001, Heilongjiang Province, China

    Yang Liu

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  1. Bo He
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He, B., Du, Y., Liu, Y. et al. Phase boundary design and enhanced electrical properties in (Bi0.5Li0.45Ag0.05)(Zr0.98Hf0.02)O3-modified KNN-based lead-free piezoceramic. J Mater Sci: Mater Electron 32, 18240–18250 (2021). https://doi.org/10.1007/s10854-021-06367-7

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