| Fe—B／Fe3O4纳米复合粒子的吸波性能研究 |
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| 引用本文： | 李婷,唐瑞鹤,于荣海. Fe—B／Fe3O4纳米复合粒子的吸波性能研究[J]. 金属功能材料, 2009, 16(4): 16-19 |
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| 作者姓名： | 李婷 唐瑞鹤 于荣海 |
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| 作者单位： | 清华大学材料科学与工程系,教育部先进材料重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金，国家杰出青年基金 |
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| 摘 要： | 采用NaBH4溶液还原FeCl3的方法制备Fe-B颗粒，并在Ar／O2气氛下干燥，使其表面不完全氧化，得到了Fe—B／Fe3O4纳米复合粒子。该粒子具有清晰的核壳结构，内核Fe-B尺寸约为20－50nm，外壳Fe3O4厚度约为3nm。将样品与石蜡按质量比1：1制成同轴样品，测试其2～18GHz下的电磁参数并进行分析计算，研究发现，由于偶极子极化、自然共振和涡流损耗，该纳米复合粒子粉末具有优良的吸波性能，其反射损耗RL在频率为12．0GHz的时候达到最小值－31dB，RL值低于－20dB（即吸收率高于99％）的频率范围为10．1～14．2GHz。
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| 关 键 词： | 磁性复合粒子 Fe—B 吸波性能 |
Microwave Absorption Properties of Core/Shell-type Fe-B/Fe3O4 Nanoparticles |
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| LI Ting,TANG Rui-he,YU Rong-hai. Microwave Absorption Properties of Core/Shell-type Fe-B/Fe3O4 Nanoparticles[J]. Metallic Functional Materials, 2009, 16(4): 16-19 |
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| Authors: | LI Ting TANG Rui-he YU Rong-hai |
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| Affiliation: | (Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China) |
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| Abstract: | Fe-B/Fe3O4 nanoparticles were prepared by chemical reduction with borohydride and dried in Ar/O2 at-mosphere. The nanoparticles have clear core/shell structure with the Fe-B core of 20-50 nm and the Fe3O4 shell of 3 nm. The nanoparticles were mixed with paraffin (1:1 in mass ratio) to form a ring sample for measuring the complex electromagnetic parameters in the frequency range of 2-18 GHz. Jt is found that the composite exhibits ex-cellent microwave absorption properties (reflection loss<-20 dB) in the range 10.1-14.2 GHz due to the orient-ational polarization, natural resonance and eddy current loss. |
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| Keywords: | Fe-B magnetic composite nanoparticles Fe-B microwave absorption properties |
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