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- Title
Effect of electric field on the microstructure and electrical properties of (In + Ta) co-doped TiO<sub>2</sub> colossal dielectric ceramics.
- Authors
Wang, Zhentao; Peng, Pai; Zhang, Liang; Wang, Nan; Tang, Bin; Cui, Bing; Liu, Juan; Xu, Dong
- Abstract
Flash-sintering is a promising method for shorting the processing time, reducing the sintering temperature, and refining grain. Here, we have successfully fabricated (In + Ta) co-doped TiO2 colossal dielectric ceramics by conventional sintering and flash sintering under electric fields from 450 to 600 V/cm. The flash sintering behavior, microstructure, and electrical properties of all samples were systematically investigated. The results show that compared with conventionally sintering, flash sintering can decrease the processing time by 15 times, reduce the sintering temperature 200 °C and had an obviously smaller grain size and a more uniform microstructure. Flash sintering had similar electric properties to conventional sintering. When the electric field was 550 V/cm, the flash-sintered sample had the best dielectric properties, in which εr > 104 and tanδ≈0.36 at 103 Hz. Meanwhile, two dielectric anomalies were observed, and the dielectric anomaly near room temperature was ascribed to the charge transfer between Ti3+ and Ti4+, which contributes to its colossal dielectric properties.
- Subjects
ELECTRIC field effects; DIELECTRICS; ELECTRIC properties; CERAMICS; MICROSTRUCTURE; DIELECTRIC properties; TRANSPARENT ceramics
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 9, p6283
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-07803-y