Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (1): 23-27.DOI: 10.3724/SP.J.1077.2014.12718

• Research Paper • Previous Articles     Next Articles

Preparation of 0.84(K0.48Na0.52)NbO3-0.16K0.56Li0.38NbO2.97 Lead-free Piezoelectric Ceramics by Multi-layer Process

ZHANG Zhi-Qiang1, 2, LIU Zhi-Fu1, LI Yong-Xiang1   

  1. (1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2012-11-29 Revised:2013-02-21 Published:2014-01-20 Online:2013-12-09
  • About author:ZHANG Zhi-Qiang.
  • Supported by:

    973-Project (2009CB623305); The Science & Technology Commission of Shanghai Municipality (10XD1404700)

Abstract: 0.84(K0.48Na0.52)NbO2.97-0.16K0.56Li0.38NbO2.97 lead-free piezoelectric ceramics were prepared by multi-layer process. Effects of sintering temperature and holding time on the density, crystal structure, microstructure, dielectric, and piezoelectric properties of the ceramics were investigated. All the ceramics exhibit a coexistence of perovskite and tungsten bronze structure. The ceramics sintered at 1050℃ for 8 min exhibit the largest relative density up to 95%, and the optimized dielectric constant, dielectric loss, and piezoelectric constant of εr=618, tanδ=0.027, and d33=112 pC/N, respectively. Moreover, the volatilization of K and Na is inhibited due to the lower sintering temperature and much shorter holding time of the multi-layer process.

Key words: potassium-sodium niobate, lead-free piezoelectric ceramics, multi-layer process, polymorphic phase transition

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