Characterization of CaCu3Ti4O12 varistor-capacitor ceramics by impedance spectroscopy

被引：0
|
作者：
Guo, Mingsen [1 ]
Wu, Tianshu [1 ]
Liu, Tao [1 ]
Wang, Sheng-Xiang [1 ]
Zhao, Xing-Zhong [2 ]
机构：
[1] Department of Physics, Wuhan University, Wuhan 430072, China
[2] Department of Physics and Center of Nanoscience and Nanotechnology, Wuhan University, Wuhan 430072, China
来源：
Journal of Applied Physics | 2006年 / 99卷 / 12期
关键词：
The varistor-capacitor property of CaCu3Ti4O 12 ceramics has been characterized by a combination of ac impedance spectroscopy and dc measurement. The results demonstrate that the non-Ohmic property and ultrahigh dielectric constant of CaCu3Ti 4O12 ceramics are associated with the grain-boundary behavior. The I-V and C-V characteristics of grain-boundary regions in CaCu 3Ti4O12 ceramics are explained on the basis of a back-to-back potential barrier model. We suggest that the origin of the potential barrier is related to Cu ions segregated to grain boundaries. © 2006 American Institute of Physics;
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