硅酸盐学报2012，Vol.40Issue(4)：479-484,6.
（1–x）K（0.5）Na（0.5）NbO3–xCa（0.3）Ba（0.7）TiO3无铅压电陶瓷的相变行为及其电性能
Phase Transition Behavior and Electrical Properties of （1-x）K（0.5）Na（0.5）NbO3-xCa（0.3）Ba（0.7）TiO3 Lead-Free Piezoelectric Ceramics
摘要
Abstract
（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.关键词
铌酸钾钠/钛酸钙钡/多晶型转变/无铅压电陶瓷/弛豫Key words
potassium sodium niobate/calcium barium titanate/polymorphic phase transition/lead-free piezoelectric ceramic/relaxation分类
化学化工引用本文复制引用
江向平,易文斌,陈超,涂娜,李小红,展红全..（1–x）K（0.5）Na（0.5）NbO3–xCa（0.3）Ba（0.7）TiO3无铅压电陶瓷的相变行为及其电性能[J].硅酸盐学报,2012,40(4):479-484,6.基金项目
国家自然科学基金 （）
江西省自然科学基金 （）
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 （）
江西省教育厅项目 （）
