Microwave-absorption properties of Fe(Mn)/ferrite nanocapsules
Microwave-absorption properties of Fe(Mn)/ferrite nanocapsules
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DOI：
10.1088/0022-3727/42/5/055008
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
Z. Han;Da Li;Xianguo Liu;D. Geng;Ji Li;Zhidong Zhang
中科院分区：
文献类型：
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作者：
Z. Han;Da Li;Xianguo Liu;D. Geng;Ji Li;Zhidong Zhang
研究了石蜡-Fe(Mn)/铁氧体纳米胶囊复合材料(含40wt%纳米胶囊)在2-18 GHz频率范围内的电磁波吸收特性。电弧法合成的Fe(Mn)/铁氧体纳米胶囊为核-壳结构，核直径10-30 nm，壳厚约5 nm。根据测量的介电常数和磁导率计算出的反射损耗(RL)在13-15 GHz范围内超过了−20dB，厚度约为1.751.95 mm。在14 GHz处，厚度为1.84 mm时，最佳RL为−28.2dB.对于厚度为1.7 mm的吸波材料，在12.7~17.1GHz范围内，RL值均超过−10dB值，几乎覆盖了整个Ku波段(12.4~18 GHz)。Fe(Mn)/铁氧体纳米胶囊优异的吸波性能在很大程度上取决于其核壳结构以及介电损耗和磁损耗的匹配。
Electromagnetic (EM) wave absorption properties of the paraffin–Fe(Mn)/ferrite nanocapsule composite (with 40 wt% nanocapsules) were investigated in the 2–18 GHz frequency range. The Fe(Mn)/ferrite nanocapsules synthesized by arc-discharging have a core–shell structure with cores 10–30 nm in diameter and shells about 5 nm in thickness. The reflection loss (RL) calculated from the measured permittivity and permeability was found to exceed −20 dB in the 13–15 GHz range for a thickness of about 1.75–1.95 mm. The optimal RL is −28.2 dB at about 14 GHz with 1.84 mm thickness. RL values exceeding −10 dB were obtained for the absorber of 1.7 mm thickness in the range 12.7–17.1 GHz, which almost covered the whole Ku-band (12.4–18 GHz). The excellent EM wave absorption properties of the Fe(Mn)/ferrite nanocapsules significantly depend on the core–shell microstructure and the match of dielectric and magnetic losses.