硅酸盐学报

Co、Mn共掺杂铋层状Na0.5Bi4.5Ti4O15无铅压电陶瓷的显微结构及电性能

作者：江向平傅小龙陈超李小红邵虹徐明珠涂娜

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

关键词：压电陶瓷铋层状介电性能钛酸铋钠

分类号：TQ174.75

出版年,卷(期):页码：2014,42(12):0-0

DOI：

摘要：

采用固相法制备Na0.5Bi4.5Ti4O15+x %Co2O3+y%MnCO3 (NBT-CM-x)( y = 0.1x)铋层状无铅压电陶瓷，研究了Co、Mn共掺杂对Na0.5Bi4.5Ti4O15陶瓷显微结构和电性能的影响。结果表明：所有样品均为铋层状结构；Co、Mn共掺杂能促进陶瓷晶粒生长；随Co、Mn共掺杂量的增加，Curie温度TC逐渐升高(均在635 ℃以上)；Cole-Cole图出现2个圆弧；适量Co、Mn共掺杂提高了Na0.5Bi4.5Ti4O15陶瓷的压电常数d33、剩余极化强度Pr、机械品质因数Qm和相对介电常数εr，降低了直流电导率σDC和介电损耗tanδ。当x = 3.0时，NBT-CM-x陶瓷的综合性能最佳：d33=24 pC/N，Pr=11.70 μC/cm2，Qm=3 117，εr=198，tanδ=0.19%，kp=9.9%，kt=14.7%，表明该陶瓷材料具有良好的高温应用前景。

Bismuth layer-structured lead-free piezoelectric ceramics of Na0.5Bi4.5Ti4O15+x%Co2O3+y%MnCO3 (NBT-CM-x) (y=0.1x) were prepared by a solid state reaction. Effect of the amount of Co and Mn co-modification on the microstructure and electrical properties of Na0.5Bi4.5Ti4O15 ceramics was investigated. It is found that all the samples have a bismuth layered structure. The grain size of the ceramics increases due to the modification of Co and Mn. The Curie temperature (TC), i.e., > 635 ℃, increases with increasing the amount of Co and Mn co-modification. The Cole-Cole plots show the presence of two semicircular arcs, indicating the existence of grain and grain-boundary effects. The piezoelectric constant, d33, remnant polarization, Pr, mechanical quality factor, Qm, and dielectric permittivity, εr, of the Na0.5Bi4.5Ti4O15 ceramics are improved, while the variation of DC conductivity, σDC, and the dielectric loss, tanδ, are reduced by a moderate amount of Co and Mn co-modification. The NBT-CM-x ceramic with x of 3.0 exhibits the optimum properties, i.e., d33=24 pC/N, Pr =11.70 μC/cm2, Qm=3 117, εr=198, tanδ= 0.19%, kp=9.9% and kt=14.7%, indicating that the NBT-CM-x=3.0 ceramic is a promising material for applications.

基金项目：

国家自然科学基金(51262009)；江西省自然科学基金(20132BAB202002, 20122BAB202001, 20122BAB203019)；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(GJJ3629, GJJ3630)资助。

作者简介：

第一作者：江向平(1964—)，男，博士，教授。通信作者：傅小龙(1988—)，男，硕士研究生。

参考文献：

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