Microwave absorption properties regulation and bandwidth formula of oriented Y_(2)Fe_(17)N_(3-δ)@SiO_(2)/PU composite synthesized by reduction-diffusion method  

作　　者：Hao Wang Liang Qiao Zu-Ying Zheng Hong-Bo Hao Tao Wang Zheng Yang Fa-Shen Li 王浩;乔亮;郑祖应;郝宏波;王涛;杨正;李发伸(Institute of Applied Magnetism,Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education,Lanzhou University,Lanzhou 730000,China;State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou 014000,China)

机构地区：[1]Institute of Applied Magnetism,Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education,Lanzhou University,Lanzhou 730000,China [2]State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou 014000,China

出　　处：《Chinese Physics B》2022年第11期341-351,共11页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2021YFB3501300);the National Natural Science Foundation of China(Grant No.51731001);the Fund from the State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization’s Key Research and Development Projects。

摘　　要：As concepts closely related to microwave absorption properties,impedance matching and phase matching were rarely combined with material parameters to regulate properties and explore related mechanisms.In this work,reduction–diffusion method was innovatively applied to synthesize rare earth alloy Y_(2)Fe_(17).In order to regulate the electromagnetic parameters of absorbers,the Y_(2)Fe_(17)N_(3-δ)particles were coated with silica(Y_(2)Fe_(17)N_(3-δ)@SiO_(2))and absorbers with different volume fractions were prepared.The relationship between impedance matching,matching thickness,and the strongest reflection loss peak(RLmin)was presented obviously.Compared to the microwave absorption properties of Y_(2)Fe_(17)N_(3-δ)/PU absorber,Y_(2)Fe_(17)N_(3-δ)@SiO_(2)/PU absorbers are more conducive to the realization of microwave absorption material standards which are thin thickness,light weight,strong absorbing intensity,and broad bandwidth.Based on microwave frequency bands,the microwave absorption properties of the absorbers were analyzed and the related parameters were listed.As an important parameter related to perfect matching,reflection factor(√ε_(r)/μ_(r))was discussed combined with microwave amplitude attenuation.According to the origin and mathematical model of bandwidth,the formula of EAB(RL<-10 dB)was derived and simplified.The calculated bandwidths agreed well with experimental results.

关 键 词：microwave absorption rare earth alloy reduction-diffusion method Y_(2)Fe_(17)N_(3-δ)@SiO_(2) reflection factor impedance and phase matching bandwidth formula 

分 类 号：TB332[一般工业技术—材料科学与工程]