硅酸盐学报

(NaBi)0.5–x(LiCe)xBi8Ti7O27 陶瓷的电性能

作者：邵虹江向平傅小龙涂娜李小红杨帆徐新民熊珊

单位：景德镇陶瓷学院材料科学与工程学院国家日用及建筑陶瓷工程技术研究中心江西省先进陶瓷重点实验室江西景德镇333000

关键词：压电性能介电性能铁电性能

分类号：TQ174

出版年,卷(期):页码：2015,43(9):1192-1196

DOI：10.14062/j.issn.0454-5648.2015.09.03

摘要：

采用固相法制备(NaBi)0.5–x(LiCe)xBi8Ti7O27 铋层状共生结构陶瓷，研究了陶瓷的结构与电性能。结果表明：所有(NaBi)0.5–x(LiCe)xBi8Ti7O27 陶瓷样品均为共生结构，Li,Ce 掺杂没有改变其固有结构；适量Li、Ce 掺杂使样品晶粒尺寸均匀，且密度增加，达到ρ=6.88 g/cm3；剩余极化强度Pr和压电常数d33均有显著提高，分别从4.19 μC/cm2和8 pC/N 提高到8.39 μC/cm2和20 pC/N；在645 ℃和657 ℃处，样品介电温谱出现介电双峰；当x=0.25 时，陶瓷样品综合性能达到最佳：d33 = 20 pC/N，平面机电耦合系数kp= 8.86 %，厚度机电耦合系数kt= 15.15 %，机械品质因子Qm= 2 152，Pr = 8.39 μC/cm2。600 ℃退极化处理后，d33 仍有15 pC/N，表明该材料在高温领域具有良好的应用前景。

The intergrowth bismuth layer-structured ceramic of (NaBi)0.5–x(LiCe)xBi8Ti7O27 was prepared by a solid-state reactionmethod. The microstructure and electrical properties of the samples were characterized. The results reveal that the(NaBi)0.5–x(LiCe)xBi8Ti7O27 material possesses intergrowth, and the structure does not change after the doping of Li/Ce. The propercontent of Li/Ce substitute can increase the density of ceramic, and the maximum density is 6.88 g/cm3. The remanent polarization,Pr, and the piezoelectric constant value of the samples increase from 4.19 μC/cm2 to 8.39 μC/cm2 and from 8 pC/N to 20 pC/N,respectively. Two dielectric anomalies of Na0.5Bi8.5Ti7O27 occur at 645 ℃ and 657 ℃. When x = 0.25, the ceramic exhibits theoptimum electrical properties, i.e., d33 = 20 pC/N, kp =8.86 %, kt = 14.11 %, Qm = 2 152, Pr = 8.39 μC/cm2. The d33 of the componentceramic sample annealed at 600 ℃ is 15 pC/N, indicating that the ceramic is a promising material for the high-temperatureapplications.

基金项目：

国家自然科学基金(51262009)；江西省自然科学基金(20133ACB20002，20142BAB216009)；江西省研究生创新专项基金(YC2013-S245)资助。

作者简介：

第一作者：邵虹(1990—)，女，硕士研究生。E-mail: shaohong19910610@163.com 通信作者：江向平(1964—)，男，教授。E-mail: jiangxp64@163.com

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