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CaCu3Ti4O12 ceramics from co-precipitation method: Dielectric properties of pellets and thick films

Barbier, Bertrand and Combettes, Céline and Guillemet-Fritsch, Sophie and Chartier, Thierry and Rossignol, Fabrice and Rumeau, Axel and Lebey, Thierry and Dutarde, Emmanuel CaCu3Ti4O12 ceramics from co-precipitation method: Dielectric properties of pellets and thick films. (2009) Journal of the European Ceramic Society, vol. 2 (n° 4). pp. 731-735. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2008.07.042

Abstract

Dielectric properties of CaCu3Ti4O12 (CCTO)-based ceramics and thick films (e ∼50m) prepared from powders synthesized by a soft chemistry method (co-precipitation) are presented and discussed. The characteristics of pellets and thick films are compared. The pellets exhibit high values of the dielectric permittivity (εr ∼1.4×105) and relatively small dielectric losses (tan δ ∼0.16) at 1 kHz and room temperature. These properties are independent of the nature of the metallization of the electrodes. In addition, the dielectric permittivity decreases when the diameter of the electrodes of the pellets increases, while the losses remain constant. This result, which is strongly related to the nature of the dielectric material in between the electrodes, constitutes a strong indication that the high dielectric permittivity values observed in this material are not related to an interfacial (electrode material) related mechanism but is an internal barrier layer capacitor (IBLC) type. Very high values of the dielectric permittivity of CCTO thick films are measured (εr ∼5×104). The differences in dielectric permittivity between thick films and dense pellets may be attributed to the difference in grain size due to different CuO contents, and to the different reactivity of the materials.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of the European Ceramic Society website : http://www.sciencedirect.com/science/journal/09552219
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Limoges - UNILIM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > ALSTOM Transport (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Ecole Nationale Supérieure de Céramique Industrielle - ENSCI (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Nihad Lahdifi
Deposited On:18 May 2010 15:24

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