Ramírez-González, J. and West, A.R. orcid.org/0000-0002-5492-2102 (2021) Electrical properties of calcia-stabilised zirconia ceramics : voltage-induced p-type conductivity and oxygen redox activity. Open Ceramics, 6. 100117.
Abstract
The electrical properties of oxide ion-conducting Ca0.15Zr0.85O1.85, CSZ, ceramics were investigated using impedance spectroscopy as a function of temperature and applied dc bias. The total resistance showed a time-dependent decrease during application of a dc bias and was attributed to the reversible introduction of p-type semiconductivity, initially at the sample surface followed by grain boundaries and the sample bulk. Electron holes may be located on under-bonded oxygen ions which are associated either with Ca dopant ions or the ceramic surfaces and interfaces, resulting in mixed oxide ion and p-type electronic conduction. This p-type behaviour with a dc bias is different from the behaviour of most well-studied, stabilised zirconias which become n-type mixed conducting due to oxygen loss at low pO2.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Author(s). Published by Elsevier Ltd on behalf of European Ceramic Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Calcia-stabilised zirconia; Impedance spectroscopy; p-type conductivity; Oxygen redox activity |
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) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 27 May 2021 10:55 |
Last Modified: | 27 May 2021 10:55 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.oceram.2021.100117 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:174578 |