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Influence of the processing rates and sintering temperatures on the dielectric properties of CaCu3Ti4O12 ceramics

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Abstract

The stoichiometric CaCu3Ti4O12 pellets were prepared by the solid state synthesis. X-ray diffraction data revealed the tenorite CuO and cuprite Cu2O secondary phases on the unpolished CaCu3Ti4O12 samples regardless of the heating rates. Also, the dielectric constant marked the highest for the CaCu3Ti4O12 sample sintered at the lowest heating rate (1°C/min), which was explained by the increased grain conductivity due to the cation reactions. On the other hand, Cu2O phase was found only on the unpolished CaCu3Ti4O12 sample sintered over 1100°C and those are considered as the remains reduced from the CuO phase. The higher sintering temperature showed the increased dielectric constant and the loss tangent of the CaCu3Ti4O12 samples, and this result could be interpreted by the impedance measurement data. The relationship between the processing condition and the dielectric properties was discussed in terms of the cation non-stoichiometry and the defect chemistry in CaCu3Ti4O12.

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Acknowledgements

This work was supported by the Office of Naval Research Capacitor Program and the American Chemical Society’s Petroleum Research Foundation.

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  1. Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR, 97331, USA

    Seunghwa Kwon & David P. Cann

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  1. Seunghwa Kwon
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  2. David P. Cann
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Correspondence to Seunghwa Kwon.

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Kwon, S., Cann, D.P. Influence of the processing rates and sintering temperatures on the dielectric properties of CaCu3Ti4O12 ceramics. J Electroceram 24, 231–236 (2010). https://doi.org/10.1007/s10832-009-9563-1

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