Yang, F. orcid.org/0000-0002-6428-7755, Wu, P. and Sinclair, D. (2017) Suppression of electrical conductivity and switching of conduction mechanisms in ‘stoichiometric’ (Na0.5Bi0.5TiO3)1-x(BiAlO3)x (0 ≤ x ≤ 0.08) solid solutions. Journal of Materials Chemistry C, 5 (29). pp. 7243-7252. ISSN 2050-7526
Abstract
(Na0.5Bi0.5TiO3)1-x(BiAlO3)x (0 ≤ x ≤ 0.08) solid solutions were prepared by solid state reaction and their electrical properties established by ac impedance spectroscopy and electromotive force transport number measurements. Incorporation of BiAlO3 (BA) decreases the electrical conductivity of Na0.5Bi0.5TiO3 (NBT) and with increasing x sequentially changes the conduction mechanism from predominant oxide-ion conduction, to mixed ionic-electronic conduction and finally to predominant electronic conduction. The suppressed oxide-ion conduction by BA incorporation significantly reduces the dielectric loss at elevated temperatures and produces excellent high-temperature dielectric materials for high BA contents. Possible reasons for the suppressed oxide-ion conduction in the NBT-BA solid solutions are discussed and we propose the local structure, especially trapping of the oxygen vacancies by Al3+ on the B-site, plays a key role in the oxide-ion conduction in these apparently ‘stoichiometric’ NBT-based solid-solution perovskite materials.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Royal Society of Chemistry. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://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 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/L027348/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 06 Jul 2017 14:58 |
Last Modified: | 16 Oct 2023 14:47 |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Refereed: | Yes |
Identification Number: | 10.1039/C7TC02519J |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:118380 |