Effect of Na2O additions on the sinterability and piezoelectric properties of lead-free 95(Na0.5K0.5)NbO3-5LiTaO3 ceramics

被引:71
作者
Kim, Min-Soo [1 ]
Lee, Dae-Su [1 ]
Park, Eon-Cheol [1 ]
Jeong, Soon-Jong [1 ]
Song, Jae-Sung [1 ]
机构
[1] Korea Electrotechnol Res Inst, Elect & Magnet Devices Grp, Chang Won 641120, South Korea
关键词
sintering; microstructure; piezoelectric properties; niobates; tantalates;
D O I
10.1016/j.jeurceramsoc.2007.02.194
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
As a candidate for lead-free piezoelectric materials, Na2O excess 95(Na0.5K0.5)NbO3-5LiTaO(3) (NKN-5LT) ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding Na2O as a sintering aid. Abnormal grain growth in NKN-5LT ceramics was observed with varying Na2O contents. This grain growth behavior was explained in terms of interface reaction-controlled nucleation and growth. The electrical properties of NKN-5LT ceramics were investigated as a function of Na2O concentration. In the 1 mol% Na2O excess NKN-5LT samples sintered at 1050 degrees C for 4 h in air, electromechanical coupling factor and piezoelectric constant of NKN-5LT ceramics were found to reach the highest values of 0.43 and 230 pC/N, respectively. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4121 / 4124
页数:4
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