Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants
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 disco...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/162078 |
| _version_ | 1824453568728399872 |
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| author | Reavley, Matthew Jun-Hui Guo, Huilu Yuan, Jianming Ng, Andrew Yun Ru Ho, Terence Yan King Tan, Hui Teng Du, Zehui Gan, Chee Lip |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Reavley, Matthew Jun-Hui Guo, Huilu Yuan, Jianming Ng, Andrew Yun Ru Ho, Terence Yan King Tan, Hui Teng Du, Zehui Gan, Chee Lip |
| author_sort | Reavley, Matthew Jun-Hui |
| collection | NTU |
| description | 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. |
| first_indexed | 2025-02-19T03:08:29Z |
| format | Journal Article |
| id | ntu-10356/162078 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:08:29Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1620782022-10-04T01:26:47Z Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants Reavley, Matthew Jun-Hui Guo, Huilu Yuan, Jianming Ng, Andrew Yun Ru Ho, Terence Yan King Tan, Hui Teng Du, Zehui Gan, Chee Lip School of Materials Science and Engineering Temasek Laboratories @ NTU Engineering::Materials Barium Titanate Ultrafast High-Temperature Sintering 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. The authors would like to acknowledge with thanks the financial support of the work by the project with PA number of DSOCL 21115 and the project with reference number of TLIG21–01. 2022-10-04T01:26:47Z 2022-10-04T01:26:47Z 2022 Journal Article 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. https://dx.doi.org/10.1016/j.jeurceramsoc.2022.04.056 0955-2219 https://hdl.handle.net/10356/162078 10.1016/j.jeurceramsoc.2022.04.056 2-s2.0-85130362785 12 42 4934 4943 en DSOCL 21115 TLIG21–01 Journal of the European Ceramic Society © 2022 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Materials Barium Titanate Ultrafast High-Temperature Sintering Reavley, Matthew Jun-Hui Guo, Huilu Yuan, Jianming Ng, Andrew Yun Ru Ho, Terence Yan King Tan, Hui Teng Du, Zehui Gan, Chee Lip Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants |
| title | Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants |
| title_full | Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants |
| title_fullStr | Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants |
| title_full_unstemmed | Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants |
| title_short | Ultrafast high-temperature sintering of barium titanate ceramics with colossal dielectric constants |
| title_sort | ultrafast high temperature sintering of barium titanate ceramics with colossal dielectric constants |
| topic | Engineering::Materials Barium Titanate Ultrafast High-Temperature Sintering |
| url | https://hdl.handle.net/10356/162078 |
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