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Dielectric and ferroelectric properties of AgSbO3-modified (Li,K,Na)(Nb,Ta)O3 lead-free piezoceramics

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Abstract

(1 − x)Li0.02(K0.48Na0.53)0.98(Nb0.8Ta0.2)O3–xAgSbO3 (abbreviated as LKNNT–xAS, 0.045 < x < 0.055) lead-free ceramics with a high relative density (~95 %) were successfully fabricated by the conventional method. Only a small AgSbO3 composition interval of 0.25 mol% was implemented for the purpose of property enhancement via the precise phase control. Room temperature XRD patterns confirmed that two phase coexistent structure of orthorhombic and tetragonal phases was obtained and the volume fraction of orthorhombic phase decreased as AgSbO3 increased from 0.045 to 0.055. A relatively high d 33 value up to 289 pC/N was achieved in the LKNNT–0.0525AS ceramics. Meanwhile the planar electromechanical coupling factor k p , the remnant polarization P r and the relative dielectric constant ε r reached 0.42, 16.3 μC/cm2, 1967, respectively. Considering the electrical properties, AgSbO3 modified (Li,K,Na)(Nb,Ta)O3 ceramics may be a potential candidate of lead-free piezoelectric ceramics.

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Acknowledgments

This work was supported by the National Nature Science Foundation of China (Grant Nos. 51332002, 51221291) and the Ministry of Science and Technology of China under the Grant (No. 2015CB654605).

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

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

    Qing Liu, Fang-Yuan Zhu, Longtu Li & Jing-Feng Li

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Qing Liu & Bo-Ping Zhang

Authors
  1. Qing Liu
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  2. Fang-Yuan Zhu
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  3. Bo-Ping Zhang
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  4. Longtu Li
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  5. Jing-Feng Li
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Correspondence to Jing-Feng Li.

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Liu, Q., Zhu, FY., Zhang, BP. et al. Dielectric and ferroelectric properties of AgSbO3-modified (Li,K,Na)(Nb,Ta)O3 lead-free piezoceramics. J Mater Sci: Mater Electron 26, 9309–9315 (2015). https://doi.org/10.1007/s10854-015-3022-3

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  • DOI: https://doi.org/10.1007/s10854-015-3022-3

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