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NbO3-LiNbO3无铅压电陶瓷的烧结特性和压电性能研究

唐福生, 杜红亮, 刘代军, 罗 发, 周万城
  

  1. 西北工业大学凝固技术国家重点实验室, 西安 710072
  • 收稿日期:2006-05-22 修回日期:2006-09-22 出版日期:2007-03-20 网络出版日期:2007-03-20

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

摘要:

采用传统陶瓷烧结工艺制备了(1-x)(K0.5Na0.5)NbO3- xLiNbO3无铅压电陶瓷, 研究了陶瓷的结构、烧结特性及电性能特征. 制备的 (K0.5Na0.5)NbO3- xLiNbO3陶瓷为单一的钙钛矿结构, 室温下其相结构随LiNbO3含量增加逐渐由正交相向四方相转变, 显微结构也由于LiNbO3含量的不同而表现出很大差异. 与(K0.5Na0.5)NbO3陶瓷相比, (K0.5Na0.5)NbO3- LiNbO3陶瓷的烧结温度降低, 烧结特性得到改善. (K0.5Na0.5)NbO3- LiNbO3陶瓷表现出优越的压电性能, 其中0.94(K0.5Na0.5)NbO3- 0.06LiNbO3(x=0.06)陶瓷的压电常数d33达到205pC/N, 机电耦合系数kp为40.3%, kt达到49.8%.

关键词: 无铅压电陶瓷, 压电性能, (K0.5Na0.5)NbO3-LiNbO3, 钙钛矿结构

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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