中国物理B ›› 2014, Vol. 23 ›› Issue (7): 78101-078101.doi: 10.1088/1674-1056/23/7/078101

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Microwave absorption properties of a double-layer absorber based on nanocomposite BaFe12O19/α -Fe and nanocrystalline α -Fe microfibers

沈湘黔, 刘洪波, 王舟, 钱昕晔, 景茂祥, 杨新春   

  1. Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, China
  • 收稿日期:2013-12-13 修回日期:2014-01-06 出版日期:2014-07-15 发布日期:2014-07-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51274106 and 51202091), the Natural Science Foundation of Jiangsu Provincial Higher Education, China (Grant No. 12KJA430001), the Science and Technology Support Program of Jiangsu Province, China (Grant Nos. BE2012143 and BE2013071), the Jiangsu Provincial Postgraduate Cultivation and Innovation Project, China (Grant No. CXZZ13_0662), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (Grant No. 1033000003).

Microwave absorption properties of a double-layer absorber based on nanocomposite BaFe12O19/α -Fe and nanocrystalline α -Fe microfibers

Shen Xiang-Qian (沈湘黔), Liu Hong-Bo (刘洪波), Wang Zhou (王舟), Qian Xin-Ye (钱昕晔), Jing Mao-Xiang (景茂祥), Yang Xin-Chun (杨新春)   

  1. Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, China
  • Received:2013-12-13 Revised:2014-01-06 Online:2014-07-15 Published:2014-07-15
  • Contact: Shen Xiang-Qian E-mail:shenxq@ujs.edu.cn
  • About author:81.07.Bc; 75.50.-y; 73.21.AC
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51274106 and 51202091), the Natural Science Foundation of Jiangsu Provincial Higher Education, China (Grant No. 12KJA430001), the Science and Technology Support Program of Jiangsu Province, China (Grant Nos. BE2012143 and BE2013071), the Jiangsu Provincial Postgraduate Cultivation and Innovation Project, China (Grant No. CXZZ13_0662), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (Grant No. 1033000003).

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摘要： The nanocomposite BaFe12O19/α -Fe and nanocrystalline α -Fe microfibers with diameters of 1-5 μm, high aspect ratios and large specific areas are prepared by the citrate gel transformation and reduction process. The nanocomposite BaFe12O19/α -Fe microfibers show some exchange-coupling interactions largely arising from the magnetization hard (BaFe12O19) and soft (α -Fe) nanoparticles. For the microwave absorptions, the double-layer structures consisting of the nanocomposite BaFe12O19/α -Fe and α -Fe microfibers each exhibit a wide band and strong absorption behavior. When the nanocomposite BaFe12O19/α -Fe microfibers are used as a matching layer of 2.3 mm in thickness and α -Fe microfibers as an absorbing layer of 1.2 mm in thickness, the optimal reflection loss (RL) achieves -47 dB at 15.6 GHz, the absorption bandwidth is about 12.7 GHz ranging from 5.3 to 18 GHz, exceeding -20 dB, which covers 72.5% C-band (4.2-8.2 GHz) and whole X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz). The enhanced absorption properties of these double-layer absorbers are mainly ascribed to the improvement in impedance matching ability and microwave multi-reflection largely resulting from the dipolar polarization, interfacial polarization, exchange-coupling interaction, and small size effect.

关键词: BaFe12O19, α-Fe, microfiber, double-layer absorber

Abstract: The nanocomposite BaFe12O19/α -Fe and nanocrystalline α -Fe microfibers with diameters of 1-5 μm, high aspect ratios and large specific areas are prepared by the citrate gel transformation and reduction process. The nanocomposite BaFe12O19/α -Fe microfibers show some exchange-coupling interactions largely arising from the magnetization hard (BaFe12O19) and soft (α -Fe) nanoparticles. For the microwave absorptions, the double-layer structures consisting of the nanocomposite BaFe12O19/α -Fe and α -Fe microfibers each exhibit a wide band and strong absorption behavior. When the nanocomposite BaFe12O19/α -Fe microfibers are used as a matching layer of 2.3 mm in thickness and α -Fe microfibers as an absorbing layer of 1.2 mm in thickness, the optimal reflection loss (RL) achieves -47 dB at 15.6 GHz, the absorption bandwidth is about 12.7 GHz ranging from 5.3 to 18 GHz, exceeding -20 dB, which covers 72.5% C-band (4.2-8.2 GHz) and whole X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz). The enhanced absorption properties of these double-layer absorbers are mainly ascribed to the improvement in impedance matching ability and microwave multi-reflection largely resulting from the dipolar polarization, interfacial polarization, exchange-coupling interaction, and small size effect.

Key words: BaFe12O19, α-Fe, microfiber, double-layer absorber

中图分类号:  (Nanocrystalline materials)

  • 81.07.Bc
75.50.-y (Studies of specific magnetic materials) 73.21.Ac (Multilayers)