硅酸盐学报

Ce掺杂0.85Bi4Ti3O12-0.15LiNbO3铋层状铁电陶瓷的显微结构与性能

作者：江向平杨帆陈超涂娜

单位：景德镇陶瓷学材料科学与工程学院江西省先进陶瓷材料重点实验室江西景德镇 333001

分类号：

出版年,卷(期):页码：2014,42(12):0-0

DOI：

摘要：

采用固相法制备CeO2掺杂改性0.85Bi4Ti3O12-0.15LiNbO3 (BTO-LN)铋层状压电陶瓷。借助于X射线衍射和扫描电子显微镜研究了CeO2掺量与BTO-LN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CeO2掺量的增加，陶瓷的晶粒尺寸变大，Curie温度TC呈下降趋势；CeO2掺杂提高了样品的压电性能，压电常数d33随掺量的增加先增大后减小，相对介电常数εr表现出相反的变化趋势；当CeO2的掺入量为0.75%时，样品的电性能最佳，即d33=25 pC/N, 机械品质因数Qm=2 895，介电损耗tan δ = 0.10%，TC=617 ℃。

The cerium modified 0.85Bi4Ti3O12–0.15LiNbO3 (BTO-LN) piezoelectric ceramics were synthesized by a conventional solid state process. The effect of cerium addition on the microstructure and electrical properties of ceramics was investigated. The 0.85Bi4Ti3O12–0.15LiNbO3 based ceramics possess a pure three-layer Aurivillius-type structure. The piezoelectric properties of the ceramics are enhanced and the dielectric loss is decreased after cerium doping. The Curie temperature, TC, decreases from 653 to 617 ℃ with increasing the cerium content. The piezoelectric constant, d33, dielectric loss, tanδ, and mechanical quality factor, Qm, for the BTO-LN ceramics with CeO2 addition of 0.75% are 25 pC/N, 0.10% and 2 895, respectively. The higher TC (i.e., 617 ℃) and the stable piezoelectric properties are obtained. It is indicated that the cerium modified BTO-LN piezoelectric ceramics are a promising candidate for high-temperature applications.

基金项目：

基金项目：国家自然科学基金(51262009)；江西省自然科学基金(20133ACB20002， 0132BAB202002，20122BAB202001)资助项目。

作者简介：

第一作者：江向平(1964—)，男，博士，教授。

参考文献：

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