摘要
采用固相反应方法制备0.98Bi_(0.5)(Na_(0.82)K_(0.18))_(0.5)TiO_3-0.02NaNbO_3无铅压电陶瓷。研究该体系陶瓷的烧结工艺对压电陶瓷的物相、显微结构及电性能的影响。结果表明,900℃合成温度下,合成粉料为ABO_3型钙钛矿结构,烧结温度变化不会使晶体结构发生改变。随着烧结温度增加,晶粒尺寸变大,陶瓷致密性提高,但过高的烧结温度使体系中出现玻璃相。电性能表明,1 200℃烧结温度下,压电陶瓷的电性能最佳:εr=1 620、tanδ=0.030、d33=138 p C/N、kp=0.40。居里温度在1 200℃时最低,TC=370℃,烧结温度降低或升高,都会使居里温度增加。在300 Hz^700 k Hz的频率范围内,150 k Hz左右空间电荷极化失去贡献,之后介电常数趋于稳定。
0.98Bi_(0.5)(Na_(0.82)K_(0.18))_(0.5)TiO_3-0.02NaNbO_3 lead-free piezoelectric ceramics were prepared by solid state reaction method. The effect of sintering process on the phase,microstructure and electric-properties were studied. The results show the calcinated powder was perovskite structure at 900 ℃. The crystal structure was not changed with the sintering process beginning. The grain size increases with sintering temperature increasing,but glass phase appears in the system because of high sintering temperature. The excellent electric properties of εr= 1 620,tanδ = 0. 030,d33= 138 p C / N,kp= 0. 40 are obtained at 1 200 ℃. The lowest Curie temperature of 370 ℃ was tested at 1 200 ℃ and the curie temperature was enhanced without sintering temperature was higher or lower than 1 200 ℃. The dielectric constant was deceased with the frequency increasing. The space charge polarization loss contribution around 150 k Hz at the range of 300 Hz-700 k Hz,and the dielectric constant changes very small when the frequency was more than 150 k Hz.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2015年第24期24100-24104,共5页
Journal of Functional Materials
基金
国家自然科学基金重点资助项目(50972106)
国家级大学生创新创业训练计划资助项目(201210060013)
关键词
无铅压电陶瓷
烧结工艺
物相
显微结构
电性能
lead-free piezoelectric ceramics
sintering process
phase
microstructure
electric-properties
