Microwave Absorbing Properties of Ni/Ferrite Mixture
Microwave Absorbing Properties of Ni/Ferrite Mixture
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Ni/铁氧体混合物的微波吸收性能
DOI：
10.1016/s1875-5372(16)30003-0
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发表时间：
2015-09-01
影响因子：
0.7
通讯作者：
Zhou Huaiying
中科院分区：
文献类型：
--
作者：
Liu Xing;Pan Shunkang;Zhou Huaiying
采用溶胶-凝胶法合成了Sr-W型平面六方晶系铁氧体，利用X射线衍射（XRD）和扫描电子显微镜（SEM）对其形貌和相结构进行了表征。采用矢量网络分析仪（VAZ）研究了不同Ni/铁氧体配比的混合物的吸波性能。结果表明，随着六方晶系铁氧体含量的增加，混合物的吸波峰向高频方向移动，当混合物中含有20%Ni和80% Sr-W型铁氧体时，其吸波性能最佳。当吸波涂层厚度为2 mm时，在12.08GHz处反射率最小，吸收峰值频率为-20.69dB，小于-10dB的带宽可达4GHz。随着吸波涂层厚度的增加，吸波峰向低频方向移动，当涂层厚度达到一定值时，混合物在2 ~ 18 GHz频率范围内出现两个吸收峰，这对探索具有带宽效应的吸波材料具有重要意义。
The Sr-W type planar hexagonal ferrite was synthesized by a sol-gel method, and its morphology and phase structure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microwave absorbing properties of the mixtures with different ratios of Ni/ferrite were studied by vector network analyzer (VAZ). The results demonstrate that with the increase of hexagonal ferrite content, the microwave absorbing peaks of the mixtures shift to higher frequencies, and when the mixture consists of 20% Ni and 80% Sr-W-type ferrite, its microwave absorbing performance is the most advantageous. When absorbing coating thickness is 2 mm, the minimum reflectivity and absorbing peak frequency is -20.69 dB at 12.08 GHz and the bandwidth less than -10 dB reaches 4 GHz. The absorbing peak shifts to low-frequency with the increase of absorbing coating thickness, and when the coating thickness reaches a certain value, the two absorbing peaks appear in the mixture in the frequency range of 2 similar to 18 GHz, which is of significance to explore the absorbing material with bandwidth effect.