&nbsp;BiFeO<sub>3</sub>-PbTiO<sub>3</sub> 系高温压电陶瓷的阻抗谱分析

程晋荣，石贵阳，祁玉发，陈建国，俞圣雯

doi:10.3969/j.issn.1007-2861.2011.04.021

上海大学学报(自然科学版) >

2011 , Vol. 17 >Issue 4: 535 - 540

DOI: https://doi.org/10.3969/j.issn.1007-2861.2011.04.021

材料科学

BiFeO₃-PbTiO₃ 系高温压电陶瓷的阻抗谱分析

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（上海大学材料科学与工程学院，上海 200072）

网络出版日期: 2011-08-30

基金资助

国家自然科学基金资助项目（50472098，50711130241）;上海市教委基金资助项目(08SG41);上海市纳米专项基金资助项目（1052NM07300）

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Impedance Spectroscopy Study of High Temperature BiFeO₃-PbTiO₃ Based Ceramics

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(School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)

Online published: 2011-08-30

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摘要

采用交流阻抗谱分析0.63(Bi_0.94La_0.06)(Ga_0.05Fe_0.95)O₃-0.37PbTiO₃(BLGF-PT)高温压电陶瓷的导电机制.阻抗谱和模谱分析表明，BLGF-PT的绝缘性能主要由晶粒贡献，BLGFPT 陶瓷的电学等效电路可以用一个电阻和一个通用电容器并联构成.由阻抗谱计算得出的晶粒电阻率随温度的升高而下降，载流子的激活能为0.88 eV.

关键词： 导电机制; 等效电路; 高温压电陶瓷; 阻抗谱

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程晋荣，石贵阳，祁玉发，陈建国，俞圣雯 . BiFeO₃-PbTiO₃ 系高温压电陶瓷的阻抗谱分析[J]. 上海大学学报(自然科学版), 2011 , 17(4) : 535 -540 . DOI: 10.3969/j.issn.1007-2861.2011.04.021

Abstract

Impedance spectroscopy has been used to investigate the conduction mechanism in the high temperature ceramics 0.63(Bi_0.94La_0.06)(Ga_0.05Fe_0.95)O₃-0.37PbTiO₃(BLGF-PT). The analysis of impedance and modulus spectroscopy has revealed that the region of grains is the most resistive component in the sample. Also, the electrical properties of BLGFPT ceramics are demonstrated, which can be represented using a parallel combination of a resistor and a universal capacitor. Resistivity of grains extracted from complex impedance plots decrease with the increase of temperature, and the calculated activation energy Ea is 0.88 eV.

Key words： conduction mechanism; equivalent circuit; high temperature ceramic; impedance spectroscopy

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