Preparation and piezoelectric properties of (K0.5Na0.5)NbO3 lead-free piezoelectric ceramics with pressure-less sintering

被引：131
作者：
Du, Hongliang [1 ]
Li, Zhimin
Tang, Fusheng
Qu, Shaobo
Pei, Zhibin
Zhou, Wancheng
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Xi An Jiao Tong Univ, Key Lab Educ Minist, Elect Mat Res Lab, Xian 710049, Peoples R China
[3] AF Engn Univ, Coll Sci, Xian 710051, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2006年 / 131卷 / 1-3期
关键词：
lead-free ceramics; piezoelectric properties; (K0.5Na0.5)NbO3; perovskite;
D O I：
10.1016/j.mseb.2006.03.039
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Lead-free piezoelectric ceramics (K0.5Na0.5)NbO3 (abbreviated as KNN) with the relative density of 97.6% have been synthesized by press-less sintering owing to the careful control of processing conditions. The phase structure of KNN ceramics with different sintering temperature and heating rate was analyzed. Results show that the pure perovskite phase with orthorhombic symmetry is in all ceramics specimens. The effect of heating rate and sintering temperature on microstructure and piezoelectric properties of KNN ceramics was investigated. The densification behavior and piezoelectric properties of KNN ceramics were enhanced by improving heating rate and sintering temperature. Pure KNN ceramics sintered at 1120 degrees C with heating rate of 5 degrees C/min showed optimized densification and piezoelectric properties (rho = 4.4 g/cm(3), d(33) = 120 pC/N-1, k(p) = 0.40 and T-c = 400 degrees C). The results show that KNN is a promising candidate for lead-free piezoelectric ceramics. (c) 2006 Elsevier B.V. All rights reserved.
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页码：83 / 87
页数：5
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