Schmidt, R, Pandey, S, Fiorenza, P et al. (1 more author) (2013) Non-stoichiometry in "CaCu3Ti4O12" (CCTO) ceramics. RSC Advances, 3 (34). 14580 - 14589. ISSN 2046-2069
Abstract
A combined powder X-ray lattice parameter and ceramic impedance spectroscopy study is presented on materials within the CaO–CuO–TiO2 ternary phase diagram. Several compositions containing CaCu3Ti4O12 (CCTO) and small amounts of secondary phases such as TiO2, CaTiO3 and CuO are analysed and two different defect mechanisms are identified as the cause of the non-stoichiometry in CCTO. The first mechanism involves a variation in the Cu content, which explains the large differences in the intrinsic bulk and extrinsic grain boundary (GB) resistance, and the formation of the ceramic internal barrier layer capacitor (IBLC) structure. The second mechanism is associated with Ca–Cu anti-site disorder causing an unusually high intrinsic bulk permittivity above that predicted from Clausius–Mossotti calculations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number EPSRC G005001/11 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 13 Jun 2014 13:26 |
Last Modified: | 13 Jun 2014 13:26 |
Published Version: | http://dx.doi.org/10.1039/c3ra41319e |
Status: | Published |
Publisher: | RSC |
Refereed: | Yes |
Identification Number: | 10.1039/c3ra41319e |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:79363 |