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%.
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.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%