Journal of Inorganic Materials

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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
  

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2006-05-22 Revised:2006-09-22 Published:2007-03-20 Online:2007-03-20

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

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