Wang, X., Fan, Y., Zhang, B. et al. (7 more authors) (2022) High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics. Journal of the European Ceramic Society, 42 (15). pp. 7381-7387. ISSN 0955-2219
Abstract
An increasing number of new dielectrics are being reported for the development of next-generation ceramic capacitors for power electronics used in clean energy technologies. Here, high discharge energy density (Wdis) ~6.1 J cm−3 with efficiency (η)~72% under a pulsed field (Emax) of 410 kV cm−1 is reported along with temperature stability up to 150 °C (Emax = 200 kV cm−1) for 0.5 K0.5Bi0.5TiO3-0.42BiFeO3-0.08Sm(Mg2/3Nb1/3)O3 (KBT-BF-SMN) bulk ceramics. The optimised composition is chemically heterogeneous but electrically homogenous, similar to several BiFeO3-based dielectrics reported previously and adding to the growing body of evidence that electrical (measured at weak-field) not chemical homogeneity is the best guide to increased Emax and enhanced energy density. KBT-BF-SMN ceramics are therefore considered as promising candidates for pulsed power and power electronics applications.
Metadata
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Copyright, Publisher and Additional Information: | © 2022 The Authors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | ||||||
Keywords: | Bismuth ferrite; Energy density; Dielectrics; Ceramic capacitors; Power electronics | ||||||
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) | ||||||
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Depositing User: | Symplectic Sheffield | ||||||
Date Deposited: | 13 Oct 2022 13:16 | ||||||
Last Modified: | 13 Oct 2022 13:16 | ||||||
Status: | Published | ||||||
Publisher: | Elsevier BV | ||||||
Refereed: | Yes | ||||||
Identification Number: | https://doi.org/10.1016/j.jeurceramsoc.2022.08.020 |