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BiFeO_3-PbTiO_3系高温压电陶瓷的阻抗谱分析 被引量:4

Impedance Spectroscopy Study of High Temperature BiFeO_3-PbTiO_3 Based Ceramics
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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.
出处 《上海大学学报(自然科学版)》 CAS CSCD 北大核心 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)
关键词 阻抗谱 高温压电陶瓷 等效电路 导电机制 impedance spectroscopy high temperature ceramic equivalent circuit conductionmechanism
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参考文献22

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