Transactions of Tianjin University

, Volume 16, Issue 2, pp 152–155 | Cite as

Molten salt synthesis of (K0.47Na0.47Li0.06)NbO3 lead-free piezoelectric ceramics

  • Jianhua Li (李建华)
  • Qingchi Sun (孙清池)
  • Weibing Ma (马卫兵)
Article

Abstract

(K0.47Na0.47Li0.06)NbO3 (KNLN) lead-free ceramics were prepared by molten salt synthesis (MSS) method using k2CO3-Na2CO3 eutectic mixtures as the flux. The microstructure and piezoelectric properties when sintered at 980–1 030 °C were investigated. The calcined powders were examined by X-ray diffraction. The microstructure of the calcined powders and sintered bodies was observed using a scanning electron microscope (SEM).The piezoelectric constant d33 was measured using a quasi-static piezoelectric d33 meter. The planar coupling coefficient Kp was calculated by resonance-antiresonance method. The experimental data for each sample’s performance indicators were the average values of 8 specimens. The relative densities of sintered specimens are above 97%, and the dielectric loss is below 0.03. It was found that (K0.47Na0.47Li0.06)NbO3 prepared by MSS is compact and lead-free. The piezoelectric constant d33 is 216 pC·N−1 and the planar electromechanical coupling factor Kp is 0.352.

Keywords

microstructure piezoelectricity X-ray diffraction (XRD) MSS method 

References

  1. [1]
    Guo Yiping, Kakimoto Ken-ichi, Ohsato Hitoshi. Dielectric and piezoelectric properties of lead-free (Na0.5K0.5) NbO3-SrTiO3 ceramics[J]. Solid State Communications, 2004, 129(5): 279–284.CrossRefGoogle Scholar
  2. [2]
    Yasuyoshi Saito, Hisaaki Takao, Toshihiko Tani et al. Lead-free piezoceramics[J]. Nature, 2004, 432(4): 84–87.Google Scholar
  3. [3]
    Zhang Shujun, Xia Ru, Shrout Thomas R. Modified (K0.5Na0.5)NbO3 based lead-free piezoelectrics with broad temperature usage range[J]. Applied Physics Letters, 2007, 91(13): 132913.CrossRefGoogle Scholar
  4. [4]
    Wu Jiagang, Xiao Dingquan, Wang Yuanyu et al. Compositional dependence of phase structure and electrical properties in (K0.42Na0.58)NbO3-LiSbO3 lead-free ceramics [J]. Journal of Applied Physics, 2007, 102(11):114113.CrossRefGoogle Scholar
  5. [5]
    Wu Jiagang, Wang Yuanyu, Xiao Dingquan et al. Piezoelectric properties of LiSbO3-modified (K0.48Na0.52)NbO3 lead-free ceramics[J]. Japanese Journal of Applied Physics, 2007, 46(11): 7375–7377.CrossRefGoogle Scholar
  6. [6]
    Zuo Ruzhong, Fang Xusheng, Ye Chun. Phase structures and electrical properties of new lead-free (Na0.5K0.5)NbO3-(Bi0.5Na0.5)TiO3 ceramics[J]. Applied Physics Letters, 2007, 90(9): 092904.CrossRefGoogle Scholar
  7. [7]
    Wu Jiagang, Xiao Dingquan, Wang Yuanyu et al. Effects of Ag content on the phase structure niobium lead-free ceramics[J]. Journal of Applied Physics, 2007,102(12): 054102.CrossRefGoogle Scholar
  8. [8]
    Du Hongliang, Zhou Wancheng, Luo Fa et al. Structure and electrical properties’ investigation of (K0.5Na0.5) NbO3-(Bi0.5Na0.5)TiO3 lead-free piezoelectric ceramics [J]. Journal of Physics D: Applied Physics, 2008, 41(8): 085416.CrossRefGoogle Scholar
  9. [9]
    Wu Jiagang, Xiao Dingquan, Wang Yuanyu et al. Effects of K content on the dielectric, piezoelectric, and ferroelectric properties of 0. 95(KxNa1−x)NbO3-0.05LiSbO3 lead-free ceramics[J]. Journal of Applied Physics, 2008, 103(2): 024102.CrossRefGoogle Scholar
  10. [10]
    Zhao Shixi, Li Qiang, Wang Lin et al. Molten salt synthesis of lead lanthanum zirconate titanate stannate powders and ceramics[J]. Materials Letters, 2006, 60(3):425–430.CrossRefGoogle Scholar
  11. [11]
    Chen Weiwu, Kume Shoichi, Watari Koji. Molten salt synthesis of 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 powder [J]. Materials Letters, 2005, 59(26): 3238–3240.CrossRefGoogle Scholar
  12. [12]
    Katayama K, Azuma Y, Takahashi Y. Molten salt synthesis of single-phase BaNd2Ti4O12 powder[J]. Journal of Material Science, 1999, 2(34): 301–305.CrossRefGoogle Scholar
  13. [13]
    Brahmaroutu B, Messing G L, Trolier-McKinstry S. Molten salt synthesis of anisotropic Sr2Nb2O7 particles[J]. Journal of American Ceramics Society, 1999, 82(6): 1565–1568.CrossRefGoogle Scholar
  14. [14]
    The Institute of Electrical and Electronics Engineers (IEEE). Standards on Piezoelectricity, American National Standards Institute[S]. ANSI/IEEE Std, 1987, 17.Google Scholar
  15. [15]
    Erling Ringgaard, Thom Wurlitzer. Lead-free piezoceramics based on alkali niobates[J]. Journal of European Ceramic Society, 2005, 25(12): 2701–2706.CrossRefGoogle Scholar

Copyright information

© Tianjin University and Springer Berlin Heidelberg 2010

Authors and Affiliations

  • Jianhua Li (李建华)
    • 1
  • Qingchi Sun (孙清池)
    • 1
  • Weibing Ma (马卫兵)
    • 1
  1. 1.School of Material Science and EngineeringTianjin UniversityTianjinChina

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