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以直流电弧等离子体法制备(Fe,Ni)的纳米粒子为前驱体,分别在350℃、400℃和450℃的氨气气氛中,通过热氨解反应合成(Fe,Ni)_4N包覆(Fe,Ni)纳米复合粒子。应用XRD,TEM,VSM,微波矢量网络分析仪对纳米粒子相成分、形貌、磁性和电磁参数进行了分析。结果表明,形成了(Fe,Ni)_4N包覆(Fe,Ni)纳米复合粒子。与前驱体粉体相比,纳米复合粒子的多重极化提高了复介电常数,且表现出明显的介电共振行为;而复磁导率呈现相似的变化规律,在8.0 GHz处出现了自然共振峰。利用电磁参数模拟微波吸收特性得出,氮化处理后复合粒子在3.6—7.8 GHz和2.0-6.4 GHz频率范围内具有良好的吸波性能(反射损耗R<-10 dB),最小反射损耗分别为-53.5 dB,-34.5 dB,可作为低频吸波剂。
(Fe, Ni) 4N (Fe, Ni) _4N nanoparticles were prepared by thermal arc ammoniation reaction at 350 ℃, 400 ℃ and 450 ℃ in an atmosphere of ammonia respectively by DC arc plasma method. Fe, Ni) nanocomposite particles. The composition, morphology, magnetism and electromagnetic parameters of nanoparticles were analyzed by XRD, TEM, VSM and microwave vector network analyzer. The results showed that (Fe, Ni) _4N coated (Fe, Ni) nanocomposite particles were formed. Compared with the precursor powders, the multipolarization of the nanocomposite particles increased the complex permittivity and showed a remarkable dielectric resonance behavior. However, the complex permeability showed a similar variation. The natural polarization appeared at 8.0 GHz Formant. The results show that the composite particles have good microwave absorbing properties (reflection loss R <-10 dB) in the frequency range of 3.6-7.8 GHz and 2.0-6.4 GHz, with the minimum reflection loss of -53.5 dB, -34.5 dB, can be used as low-frequency absorbers.