BiFeO_3-PbTiO_3系高温压电陶瓷的阻抗谱分析  

Impedance Spectroscopy Study of High Temperature BiFeO_3-PbTiO_3 Based Ceramics

作　　者：程晋荣[1] 石贵阳[1] 祁玉发[1] 陈建国[1] 俞圣雯[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《上海大学学报（自然科学版）》2011年第4期535-540,共6页Journal of Shanghai University:Natural Science Edition

基　　金：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)

摘　　要：采用交流阻抗谱分析0.63(Bi_(0.94)La_(0.06))(Ca_(0.05)Fe_(0.95))O_3-0.37PbTiO_3(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.Impedance spectroscopy has been used to investigate the conduction mechanism in the high I ~ temperature ceramics 0. 63 （ Bio.94 La0.o6 ） （ Ga0.05 Feo.95 ） 03-0. 37PbTiO3 （BLGF-PT）. The anlysls 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.

关 键 词：阻抗谱 高温压电陶瓷 等效电路 导电机制 

分 类 号：TM228[一般工业技术—材料科学与工程]