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Issue 33, 2009
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Comment on the origin(s) of the giant permittivity effect in CaCu3Ti4O12 single crystals and ceramics

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Abstract

Impedance spectroscopy has been performed on CaCu3Ti4O12 (CCTO) single crystals and ceramics using Au and InGa alloy electrodes. The extrinsic effect responsible for the giant permittivity observed at radio-frequencies near room temperature is shown to be different for single crystals and ceramics. For single crystals it is attributed to a non-ohmic electrode contact to semiconducting CCTO. For ceramics it is attributed to an internal barrier layer capacitor mechanism associated with semiconducting CCTO grains and insulating grain boundaries.

Graphical abstract: Comment on the origin(s) of the giant permittivity effect in CaCu3Ti4O12 single crystals and ceramics

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Publication details

The article was received on 05 Jun 2009, accepted on 08 Jul 2009 and first published on 23 Jul 2009


Article type: Communication
DOI: 10.1039/B910871H
Citation: J. Mater. Chem., 2009,19, 5916-5919
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    Comment on the origin(s) of the giant permittivity effect in CaCu3Ti4O12 single crystals and ceramics

    M. C. Ferrarelli, D. C. Sinclair, A. R. West, H. A. Dabkowska, A. Dabkowski and G. M. Luke, J. Mater. Chem., 2009, 19, 5916
    DOI: 10.1039/B910871H

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