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Ce 掺杂对0.85Bi4Ti3O12-0.15LiNbO3 铋层状压电陶瓷电性能的影响
作者:杨帆 江向平 涂娜 邵虹 徐新民 熊珊 
单位:景德镇陶瓷学院材料科学与工程学院 江西省先进陶瓷材料重点实验室 江西 景德镇 333001 
关键词:铋层状结构 压电陶瓷 阻抗谱 电导率 
分类号:TQ174
出版年,卷(期):页码:2015,43(9):1209-1213
DOI:10.14062/j.issn.0454-5648.2015.09.06
摘要:

 采用固相法制备0.85Bi4Ti3O12-0.15LiNbO3-0.75%CeO2(BTO-LN-0.75Ce)铋层状压电陶瓷。通过阻抗谱研究不同温度和频率对样品电性能的影响。结果表明:介电常数ε*的实部ε和虚部ε在低频区域出现分散现象;随频率增大,阻抗(Z*)的实部Z值逐渐减小,而虚部Z值先增大后减小。阻抗Cole-Cole 图表明:晶粒内部对电传导过程起主要作用, 并可用一个并联电阻电容电路等效。陶瓷样品的阻抗值随温度的升高而减小,电导率值在低频区域相对稳定,且电导率满足Arrhenius 关系,说明陶瓷样品的电导是热激活的过程。BTO-LN-0.75Ce 的电导活化能小于BTO-LN 的电导活化能,分别为1.591 9 1.7562eV

 The cerium modified 0.85Bi4Ti3O12-0.15LiNbO3-0.75%CeO2 (BTO-LN-0.75Ce) piezoelectric ceramics were synthesizedby a conventional solid state processing. The effects of temperature and frequency on the electrical properties of ceramics wereinvestigated. The results show that the real (ε) and the imaginary (ε) parts of permittivity both appear dispersive at low frequencies.The values of the real (Z′) part of impedance (Z*) decrease, and the values of the imaginary (Z″) part firstly increase and then decreasewith increasing frequency. According to the Cole-Cole plots, the grain interior is a major contribution to the electrical conductionprocess as a parallel resistance-capacitance equivalent circuit. The semicircles become smaller when temperature increases, indicatingthat the impedance decreases with the increase of temperature. The stabilized conductivity appears in the low frequency region at hightemperatures. The conductivity obeys the Arrhenius law, showing the thermal activation of the process. The grain activation energy,Ea1(g), of BTO-LN-0.75Ce (i.e., 1.591 9 eV) is lower than Ea2(g) of BTO-LN (i.e., 1.756 2 eV).

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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:杨 帆(1990—),男,硕士研究生。E-mail: jdzyangfan@163.com 通信作者:江向平(1964—),男,教授。E-mail: jiangxp64@163.com
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