| Enhancement of microwave absorption of nanocomposite BaFe_(12)O_(19)/α-Fe microfibers |
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| 引用本文： | 杨新春,刘瑞江,沈湘黔,宋福展,景茂祥,孟献丰.Enhancement of microwave absorption of nanocomposite BaFe_(12)O_(19)/α-Fe microfibers[J].中国物理 B,2013,22(5):58101-058101. |
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| 作者姓名： | 杨新春 刘瑞江 沈湘黔 宋福展 景茂祥 孟献丰 |
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| 作者单位： | a Institute of Advanced Materials, Jiangsu University, Zhenjiang 212013, China;b School of Pharmacy, Jiangsu University, Zhenjiang 212013, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant Nos. 51274106 and 51202091);the Natural Science Foundation of Higher Education of Jiangsu Province, China (Grant No. 12KJA430001);the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103227110006);the Science and Technology Support Program of Jiangsu Province, China (Grant No. BE2012143);the Postgraduate Cultivation and Innovation Project of Jiangsu Province, China (Grant No. CXZZ11 0557) |
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| 摘 要： | Nanocomposite BaFe12O19/α-Fe microfibers with diameters of about 1-5 μm are prepared by the organic gelthermal selective reduction process. The binary phase of BaFe12O19 and α-Fe is formed after reduction of the precursor BaFe12O19/α-Fe2O3 microfibers at 350℃ for 1 h. These nanocomposite microfibers are fabricated from α-Fe (16-22 nm in diameter) and BaFe12O19 particles (36-42 nm in diameter) and basically exhibit a single-phase-like magnetization behavior, with a high saturation magnetization and coercive force arising from the exchange-coupling interactions of soft α-Fe and hard BaFe12O19 . The microwave absorption characteristics in a 2-18 GHz frequency range of the nanocomposite BaFe12O19/α-Fe microfibers are mainly influenced by their mass ratio of α-Fe/BaFe12O19 and specimen thickness. It is found that the nanocomposite BaFe12O19/α-Fe microfibers with a mass ratio of 1:6 and specimen thickness of 2.5 mm show an optimal reflection loss (RL) of 29.7 dB at 13.5 GHz and the bandwidth with RL exceeding 10 dB covers the whole Ku-band (12.4-18.0 GHz). This enhancement of microwave absorption can be attributed to the heterostructure of soft, nano, conducting α-Fe particles embedded in hard, nano, semiconducting barium ferrite, which improves the dipolar polarization, interfacial polarization, exchange-coupling interaction, and anisotropic energy in the nanocomposite BaFe12O19/α-Fe microfibers.
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| 收稿时间： | 2012-08-26 |
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