Multiple nature resonance behavior of BaFexTiO19 controlled by Fe/Ba ratio and its regulation on microwave absorption properties

Multiple nature resonance behavior of BaFexTiO19 controlled by Fe/Ba ratio and its regulation on microwave absorption properties
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Fe/Ba比例控制BaFexTiO19的多重自然共振行为及其对微波吸收性能的调控

DOI:
10.1016/j.jallcom.2018.09.278
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发表时间:
2019-01
影响因子:
6.2
通讯作者:
Junding Zou
Junding Zou
中科院分区:
材料科学2区
文献类型:
--
作者:
Chuyang Liu;Yanting Zhang;Yujing Zhang;Gang Fang;Xinrui Zhao;Kangsen Peng;Junding Zou

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为了在35 GHz的大气窗口附近获得良好的微波吸收性能,采用溶胶凝胶法合成了Fe/Ba比为11:1~9.5:1的掺钛铁氧体BaFexTiO19。在35 GHz附近获得了宽频带和 ∼ -37 分贝的强微波吸收,厚度为2.8 mm,Fe/Ba值为10:1~9.5:1。充分揭示了∼的多共振行为与Fe/Ba值之间的关系。结果表明,随着Fe/Ba比从11:1降低到10:1-9.5:1,共振峰向低处移动,Fe2+与Fe3+之间的交换耦合峰逐渐增强。阻抗匹配原理的计算结合四分之一波长理论给出了Ba2+铁氧体具有良好的微波吸收性能所需的磁导率,与实验结果完全一致。这一研究将有助于理解影响微波吸收性能的多重共振行为的本质,并有助于设计未来高效的微波吸收材料。
To achieve excellent microwave absorption properties around atmospheric window of 35 GHz, Ti4+ions doped barium ferrites BaFexTiO19with Fe/Ba ratio of 11:1–9.5:1 are synthesized by a sol-gel progress. Broad bandwidth of ∼11 GHz and strong microwave absorption of ∼ -37 dB are attained around 35 GHz with thickness of ∼2.8 mm and Fe/Ba ratio of 10:1–9.5:1. The correlation between Fe/Ba ratio and the multi-resonance behavior of BaFexTiO19is fully revealed. It is found that the resonance peak shifts to lower range and the peak ascribed to exchange coupling between Fe2+and Fe3+enhances gradually with Fe/Ba ratio decreasing from 11:1 to 10:1–9.5:1. The impedance matching principle calculations combined with quarter-wavelength theory give the required permeability of the barium ferrites for considerable microwave absorption properties, and fully confirm the experimental results. This study would be beneficial to both understanding the nature of the multiple resonance behavior impacting on the microwave absorption properties and designing the future high-efficiency microwave absorbers.
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