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Improved Electrical Properties of BaTiO3 – coated CaCu3Ti4O12 Dielectrics

Published online by Cambridge University Press:  12 July 2012

Hui Eun Kim
Affiliation:
Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea
Sung Yun Lee
Affiliation:
Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea
Sang-Im Yoo*
Affiliation:
Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea
*
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Abstract

We report a significant improvement in the electrical properties of CaCu3Ti4O12 (CCTO) dielectrics by the BaTiO3 (BTO) additive. The addition of BTO to CCTO was performed using two different methods of a solid-state mixing and a sol-gel coating. Compared with pure CCTO ceramics (εr ∼ 52,000 and tanδ ∼ 0.38 at 100 kHz), BTO-added CCTO samples commonly showed a large improvement in the dielectric loss property although their dielectric constants were depressed around one order of magnitude; εr ∼ 5900 and tanδ ∼0.05 for 5 mol% BTO-coated CCTO sample and εr ∼ 4,075 and tanδ ∼ 0.02 for 5 mol% BTO-mixed CCTO sample. In addition, BTO-coated CCTO samples showed relatively lower leakage current than those of BTO-mixed CCTO samples, implying that the sol-gel coating is more effective for improving the electrical properties of CCTO.

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Articles
Copyright
Copyright © Materials Research Society 2012

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