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硅酸盐学报 2011

(1–x)Bi4Ti3O12–xK0.5Na0.5NbO3铋层状陶瓷的结构与性能

涂娜,江向平,傅小龙,杨庆,陈超

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Abstract:

采用固相法制备(1–x)Bi4Ti3O12–xK0.5Na0.5NbO3(BIT–KNN，x=0，0.05，0.10，0.15，0.20，0.30)铋层状压电陶瓷。用X射线衍射分析及扫描电镜等测试方法研究KNN掺量与BIT–KNN陶瓷晶体结构和电性能的关系。结果表明所有陶瓷样品均为单一的正交相结构；随着KNN掺量的增加，陶瓷的晶粒尺寸变大，Curie温度θC呈下降趋势；KNN掺杂提高了样品的压电性能，压电常数d33随着KNN掺量的增加先增大后减小，相对介电常数εr表现相反的变化趋势；当x=0.10时，样品的电性能达到最佳值，即d33=11pC/N，相对密度r=96.5%，机电耦合系数kp=4.52%，εr=151，介电损耗tanδ=0.45%，θC=619℃。

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