Hoang, A.-P., Steiner, S., Yang, F. et al. (3 more authors) (2021) Reducing dielectric loss in Na0.5Bi0.5TiO3 based high temperature capacitor material. Journal of the European Ceramic Society, 41 (4). pp. 2587-2595. ISSN 0955-2219
Abstract
The demand for capacitors exhibiting low sensitivity towards temperature changes and high power peaks has increased significantly. Recently, Na0.5Bi0.5TiO3 (NBT) based ceramics became excellent candidates for such extreme temperature capacitors. The dielectric loss of these materials is, however, difficult to control because of the complex defect chemistry of NBT based ceramics. Therefore, it is the limiting factor for high temperature applications. In this work, we present a strategy to increase the upper temperature limit for low dielectric loss. The addition of BiAlO3 to Na0.5Bi0.5TiO3-BaTiO3-CaZrO3 reduces the loss and sensitivity towards Bi evaporation during synthesis. For unmodified samples, the relative permittivity (εr = 581, at 1 kHz) varies less than 15 %, while the dielectric loss stays below 0.02 between -68 and 368 °C. With the addition of BiAlO3, the temperature range of low loss extends from -68 to 391 °C at even higher permittivity (εr = 628, at 1 kHz).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Elsevier. This is an author produced version of a paper subsequently published in Journal of the European Ceramic Society. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | High temperature capacitor; defect chemistry; dielectric loss; lead-free; NBT |
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 EP/L027348/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 08 Dec 2020 08:26 |
Last Modified: | 02 Feb 2022 11:57 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.jeurceramsoc.2020.07.005 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:168806 |