Effect of poling condition on piezoelectric properties of (K_(0.5)Na_(0.5))NbO_3 ceramics  

作　　者：杜红亮 唐福生 李智敏 周万城 屈绍波 裴志斌 

机构地区：[1]State Key Laboratory of Solidification Processing Northwestern Polytechnical University, Xi'an 710072, China [2]State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical University,Xi'an 710072,China [3]Key Laboratory of Electronic Materials ResearchMinistry of Education, Xi'an Jiaotong University,Xi'an 710049, China [4]College of Science Air Force Engineering University, Xi'an 710051,China

出　　处：《中国有色金属学会会刊：英文版》2006年第B02期462-465,共4页Transactions of Nonferrous Metals Society of China

基　　金：Project(10474077) supported by the National Natural Science Foundation of China Project(2002CB613304) supported by the National Basic Research Program of China

摘　　要：The lead-free piezoelectric ceramics (K0.5Na0.5)NbO3 (abbreviated as KNN) with the relative density of 97.6% were synthesized by press-less sintering owing to the careful control of processing conditions. The phase structure of KNN ceramics was analyzed. The results show that the pure perovskite phase with orthorhombic symmetry is in all ceramics specimens. The effect of poling conditions on the piezoelectric properties of KNN ceramics was investigated. The results show that the piezoelectric constant d33 and electromechanical coupling factor kp increase with poling field, poling temperature and poling time increasing, then decrease because of electric broken. Take into account of poling conditions and piezoelectric properties of pure KNN ceramics, the optimum poling conditions for pure KNN ceramics are poling field of 4 kV/mm, poling temperature of 140℃and poling time of 20-25 min.The lead-free piezoelectric ceramics （K0.5Na0.5）NbO3 （abbreviated as KNN） with the relative density of 97.6% were synthesized by press-less sintering owing to the careful control of processing conditions. The phase structure of KNN ceramics was analyzed. The results show that the pure perovskite phase with orthorhombic symmetry is in all ceramics specimens. The effect of poling conditions on the piezoelectric properties of KNN ceramics was investigated. The results show that the piezoelectric constant d33 and electromechanical coupling factor kp increase with poling field, poling temperature and poling time increasing, then decrease because of electric broken. Take into account of poling conditions and piezoelectric properties of pure KNN ceramics, the optimum poling conditions for pure KNN ceramics are poling field of 4 kV/mm, poling temperature of 140 ℃ and poling time of 20-25 min.

关 键 词：(K0.5Na0.5)NbO3 无铅压电陶瓷 压电性质 极化条件 

分 类 号：TB34[一般工业技术—材料科学与工程]