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Issue 41, 2016
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Improvement of (K,Na)NbO3-based lead-free piezoelectric ceramics by asymmetric octahedra

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Due to their excellent piezoelectric properties, including a coupling factor kp = 0.55, dielectric constant εT33/ε0 = 2725, piezoelectric constant d33 = 375 pC N−1, Qm = 60, and dielectric tan δ = 1.87%, 0.891(K0.37Na0.63)0.86Ca0.04Li0.02Nb0.85O3−δ–0.041K0.85Ti0.85Nb1.15O5–0.055BaZrO3–0.0016Co3O4–0.0025Fe2O3–0.0069ZnO ceramic without Ta, Sb, Bi, or Hf is promising as a lead-free piezoelectric ceramic. In this system, a solid solution of BaZrO3 into (K0.37Na0.63)0.86Ca0.04Li0.02Nb0.85O3−δ effectively contributes to both the piezoelectric properties and the stability around room temperature. The solid solution of BaZrO3 induces asymmetry in the BO6 octahedra in the c-axis direction, improving kp, steeply increasing εT33/ε0 at room temperature, while reducing the temperature dependence of εT33/ε0.

Graphical abstract: Improvement of (K,Na)NbO3-based lead-free piezoelectric ceramics by asymmetric octahedra

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Publication details

The article was received on 22 Jul 2016, accepted on 19 Sep 2016 and first published on 20 Sep 2016

Article type: Paper
DOI: 10.1039/C6TC03119F
Citation: J. Mater. Chem. C, 2016,4, 9756-9761
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    Improvement of (K,Na)NbO3-based lead-free piezoelectric ceramics by asymmetric octahedra

    H. Kozuka, H. Yamada, T. Matsuoka, K. Kitamura, M. Yamazaki, T. Kasashima, Y. Okimura and K. Ohbayashi, J. Mater. Chem. C, 2016, 4, 9756
    DOI: 10.1039/C6TC03119F

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