摘要
采用固相法制备了(1–x)K0.5Na0.5NbO3–xCa0.3Ba0.7TiO3[(1–x)KNN–xCBT]系列无铅压电陶瓷,研究了CBT的含量(x=0～0.08)对样品的物相结构、显微形貌、介电性能以及压电性能的影响。结果表明:所有样品都具有钙钛矿结构;随着x的增加,室温下样品从正交相逐渐向四方相过渡并且Curie温度向低温方向移动,样品的压电常数d33与机电耦合系数kp均先升高后降低。(1–x)KNN–xCBT多晶型转变位于0.03≤x≤0.04,当x=0.03时,样品的压电性能达到最佳:d33=142 pC/N,kp=40%,其介电损耗tanδ从室温到380℃范围内几乎不变且小于0.05,表明组分为x=0.03的陶瓷是一种非常有前景的无铅压电材料。
（1–x）K0.5Na0.5NbO3–xCa0.3Ba0.7TiO3 [abbreviated as（1–x）KNN–xCBT] lead-free piezoelectric ceramics were prepared by a solid state reaction method.The effects of the content of CBT（x = 0–0.08） on the phase,microstructure,dielectric,and piezoelectric properties of samples were investigated.The results show that all the samples possess a perovskite structure.The phase structure of the samples at room temperature changed from orthorhombic symmetry to tetragonal symmetry,and the piezoelectric constant d33 and planar coupling factor kp of samples both first increased and then decreased,and the Curie temperature decreased with increasing the amount of CBT.In addition,a polymorphic phase transition from orthorhombic to tetragonal symmetry located in the composition range of 0.03≤x≤0.04.The ceramic sample in the composition when x = 0.03 had optimal piezoelectric properties（d33 = 142 pC/N,kp = 40%）,and its dielectric losses were stable（i.e.,0.05） in the temperature range from room temperature to 380 ℃,indicating that the ceramic in the composition when x = 0.03 was a promising lead-free piezoelectric material.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2012年第4期479-484,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50862005
51062005
91022027)
江西省自然科学基金(2010GQW0037
2010GQW0038)
江西省高等学校"先进陶瓷材料"科技创新团队
江西省主要学科学术和技术带头人培养对象计划项目(2010DD00800)
江西省教育厅项目(GJJ11196
GJJ11197
GJ11204
GJJ10226)
关键词
铌酸钾钠
钛酸钙钡
多晶型转变
无铅压电陶瓷
弛豫
potassium sodium niobate
calcium barium titanate
polymorphic phase transition
lead-free piezoelectric ceramic
relaxation
