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Title: Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants
Authors: Reavley, Matthew Jun-Hui
Guo, Huilu
Yuan, Jianming
Ng, Andrew Yun Ru
Ho, Terence Yan King
Tan, Hui Teng
Du, Zehui
Gan, Chee Lip
Keywords: Engineering::Materials
Issue Date: 2022
Source: Reavley, M. J., Guo, H., Yuan, J., Ng, A. Y. R., Ho, T. Y. K., Tan, H. T., Du, Z. & Gan, C. L. (2022). Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants. Journal of the European Ceramic Society, 42(12), 4934-4943.
Project: DSOCL 21115
Journal: Journal of the European Ceramic Society
Abstract: Application of Ultrafast High-temperature Sintering (UHS) technique to rapidly densify barium titanate ceramics has been explored for the first time. Bulk ceramic with ~94% density was obtained by UHS at ~1340 °C for 60 seconds. The densification process was accompanied with progressive sample discolouration from light to dark grey. Further analysis indicates that oxygen vacancy and its associated Ti-rich phase Ba4Ti12O27 are present in the ceramics. Their roles in ultrafast densification and sample discoloration are discussed. Due to the presence of oxygen vacancies, the UHSed ceramics generally exhibit a colossal dielectric constant of ~ 15–30k at 1 kHz, with dielectric loss of ~0.07–0.10, while the ceramics without oxygen vacancy retain a dielectric constant of ~3000–6000 and dielectric loss of ~ 0.06 at 1 kHz which are comparable to that of the conventionally sintered ceramics. Furthermore, the challenges in applying UHS to sinter thick BT ceramics are discussed, aided by thermal simulations.
ISSN: 0955-2219
DOI: 10.1016/j.jeurceramsoc.2022.04.056
Rights: © 2022 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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