Issue 33, 2009
From the journal:

Journal of Materials Chemistry

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

Matthew C. Ferrarelli,a   Derek C. Sinclair,*a   Anthony R. West,a   Hanna A. Dabkowska,b   Antoni Dabkowskib  and  Graeme M. Lukeb  

* Corresponding authors

a Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, United Kingdom
E-mail: d.c.sinclair@sheffield.ac.uk
Fax: +00441142225943
Tel: +00441142225974

b Brockhouse Institute for Materials Research, Department of Physics and Astronomy, McMaster University, Hamilton, Canada
Fax: +9055461252
Tel: +9055259140 ext 27092

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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Article information

DOI
https://doi.org/10.1039/B910871H
Article type
Communication
Submitted
05 Jun 2009
Accepted
08 Jul 2009
First published
23 Jul 2009

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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