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Low-Temperature Sintering of CuO-Doped 0.94(K0.48Na0.535)NbO3–0.06LiNbO3 Lead-Free Piezoelectric Ceramics

Authors

  • Rongxia Huang,

    Corresponding author
    1. 1State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
      †Author to whom correspondence should be addressed. e-mail: 9319484@qq.com
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  • Yuzhen Zhao,

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

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

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

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

    1. 1State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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  • L. An—contributing editor

  • This work was supported by National Natural Science Foundation of China.

†Author to whom correspondence should be addressed. e-mail: 9319484@qq.com

Abstract

Lead-free 0.94(K0.48Na0.535)NbO3–0.06LiNbO3xmol%CuO ceramics were synthesized by conventional ceramics processes. The doping of CuO can decrease the sintering temperature to 890°C and effectively promote the densification of 0.94(K0.48Na0.535)NbO3–0.06LiNbO3 ceramics. X-ray diffraction result reveals that doping of CuO induces lattice distortion. Homogeneous grain growth is observed, due to the presence of liquid phase that resulted from the addition of CuO. The ceramics sintered at 890°C show fairly good properties with the planar electromechanical coupling factor kp=34.8%, piezoelectric constant d33=157.5 pC/N, dielectric constant ɛ33T0=391, and mechanical quality factor Qm=173.5.

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