Dielectric spectroscopy analysis of CaCu3Ti4O12 polycrystalline systems

被引:50
作者
Bueno, P. R. [1 ]
Ramirez, M. A. [1 ]
Varela, J. A. [1 ]
Longo, E. [1 ]
机构
[1] Univ Estadual Paulista, Dept Fisicoquim, Inst Quim, BR-14800900 Sao Paulo, Brazil
基金
巴西圣保罗研究基金会;
关键词
D O I
10.1063/1.2386916
中图分类号
O59 [应用物理学];
学科分类号
摘要
Dielectric spectroscopy was used in this study to examine CaCu3Ti4O12 polycrystalline samples. The analysis involved systems presenting low non-Ohmic properties, and the grain's internal domain was evaluated separately from the contribution of barrier-layer capacitances associated with Schottky-type barriers in this type of material. The effect of oxygen-rich atmosphere and high cooling rate was evaluated, revealing a strong increase in the dielectric properties of the CaCu3Ti4O12 system under these conditions. This effect was attributed to a chemical change in the grain's internal domain, which may be considered an internal barrier-layer capacitance of the polycrystalline material. (c) 2006 American Institute of Physics.
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页数:3
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