报告详情
Hydrothermal synthesis and dielectric responses of sillenite Bi25FeO39 microcrystals with hierarchical microstructures
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更新：2024-05-21 11:56:08
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口头报告
报告开始：2024年05月30日 19:50（Asia/Shanghai）
报告时间：10min
所在会场：[S7] Minerals and Advanced Energy Materials [S7-2] Evening of May 30th
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摘要
Sillenite Bi25FeO39 particles have drawn considerable interest due to their high performance in photocatalytic, dielectric and humidity sensing fields. However, their synthetic processes especially the approach to modulate their shapes and sizes have not been described explicitly. In this paper, a facile hydrothermal route to prepare dispersed Bi25FeO39 microcrystals is provided. By changing the ratio of Bi3+: Fe3+ from 1:1 to 2:1 in aqueous solution, the as-prepared Bi25FeO39 microcrystals are categorized from tetrahedral to cubic series. Further tailoring on processing parameters such as pH value, temperature and reaction time results in various hierarchical micro-nanostructures. The compositions, morphologies and growth evolution of the as-prepared Bi25FeO39 are discussed. The dielectric and ferroelectric properties were tested and compared. The results show that Bi25FeO39 has obvious relaxation characteristics, and is more suitable for applications in the temperature range from room temperature to 200 °C above 105 Hz, where the dielectric constant can be kept around 150 and the dielectric loss is as low as 0.2; the maximum polarisation strength of the ferroelectric performance test further verifies the dielectric test results, and the strongest ferroelectricity was measured for the BFO-C2, and the cubic system of the BFO-C1 and BFO-C2 have the largest coercive electric field, indicating that the cubic series requires a larger electric field to drive the domain flip than the tetrahedral series of BFO; the maximum polarisation strength and smaller residual polarisation strength of BFO-T3 make it possible to be used in the field of energy storage capacitors in the future.
关键词
Bismuth ferrite; Hydrothermal processes; Hierarchical nanostructures; Dielectric properties
报告人
Zhimin Fu
China University of Mining and Technology稿件作者
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重要日期
-
会议日期
05月29日
2024
至06月01日
2024
-
05月08日 2024
初稿截稿日期
主办单位
中国矿业大学
历届会议
-
2022年05月26日 中国 徐州市
第九届能源、资源、环境与可持续发展国际会议 -
2019年05月31日 中国 Xuzhou
能源、资源、环境与可持续发展国际会议
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