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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 2: 323 - 327

DOI: https://doi.org/10.3724/SP.J.1077.2007.00323

Research Paper

Sintering Characteristic and Piezoelectric Properties of Lead-free (K0.5 Na0.5)NbO3-LiNbO3 Ceramics

  • TANG Fu-Sheng ,
  • DU Hong-Liang ,
  • LIU Dai-Jun ,
  • LUO Fa ,
  • ZHOU Wan-Cheng
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  • State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Received date: 2006-05-22

  Revised date: 2006-09-22

  Online published: 2007-03-20

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Abstract

Lead-free (1-x)(1-x)(K0.5Na0.5)NbO3- xLiNbO3 piezoelectric ceramics were prepared by a traditional ceramic processing. The sintering characteristic, the microstructure and electrical properties of (1-x)(K0.5Na0.5)NbO3- LiNbO3
ceramics were investigated. Results show that all specimens exhibit a pure perovskite structure and the phase structure at room temperature transforms from orthorhombic to tetragonal with the increase of LiNbO3.The microstructure of (1-x)(K0.5Na0.5)NbO3- LiNbO3 ceramics exhibits apparent difference due to different amounts of LiNbO3. The sinterability of (1-x)(K0.5Na0.5)NbO3- LiNbO3 is improved and the sintering temperature is lower than that of pure KNN ceramics. The (1-x)(K0.5Na0.5)NbO3- xLiNbO3(x=0.06) ceramics exhibits an excellent piezoelectric properties with the piezoelectric constant d33, the electromechanical coupling coefficients kp and kt of 205pC/N, 40.3% and 49.8%, respectively.

Key words： lead-free piezoelectric ceramics; piezoelectric properties; (K0.5Na0.5)NbO3-LiNbO3; perovskite structure

Cite this article

TANG Fu-Sheng , DU Hong-Liang , LIU Dai-Jun , LUO Fa , ZHOU Wan-Cheng . Sintering Characteristic and Piezoelectric Properties of Lead-free (K0.5 Na0.5)NbO3-LiNbO3 Ceramics
[J]. Journal of Inorganic Materials, 2007 , 22(2) : 323 -327 . DOI: 10.3724/SP.J.1077.2007.00323

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