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中文摘要：
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。
英文摘要：
（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.
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同项目期刊论文
Electronic and Optical Properties of KNbO3,NaNbO3 and K0.5Na0.5NbO3 in Paraelectric Cubic Phase: a C
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