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Electromagnetic wave absorption properties in Ku-band of magnetic iron nitrides prepared by high energy ball milling
Journal of Magnetism and Magnetic Materials ( IF 2.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jmmm.2020.167246
Mengying Gong , Jing Gao , Depeng Shen , Ping Li , Weiping Tong , Chunzhong Liu

Abstract Gas nitriding and high-energy ball milling were adopt to prepare iron nitrides samples. The iron nitrides samples with different nitrogen contents and different magnetic properties were obtained through mixing with different ingredients with high-energy ball milling process. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), vibrating sample magnetometer (VSM) and vector network analyzer (VNA). The iron nitrides samples were nanostructured and contained lots of interfaces, boundaries and defects inside the particles. The electromagnetic wave reflection loss (RL) value was simulated according to transmission line theory by using the samples’ electromagnetic parameters. The sample with a saturation magnetization of 173.3 emu∙g−1 had the best RL value, which reached −63.31 dB at 17.93 GHz with a thickness of 1.77 mm. The samples with Ms value greater than 90.9 emu∙g−1 could effectively absorb electromagnetic waves in the Ku band. The absorption performance decreased with the decreasing Ms value. The nanostructure obtained by high-energy ball milling was discussed to be beneficial for improving the permittivity and the permeability of the iron nitrides samples in the Ku band. The electromagnetic wave absorption mechanisms were also analyzed. In addition, this study offers a reference for industrially producing electromagnetic wave absorbing materials with low cost.

中文翻译:

高能球磨制备磁性氮化铁的Ku波段电磁波吸收特性

摘要 采用气体渗氮和高能球磨制备氮化铁样品。通过高能球磨工艺与不同成分混合得到不同氮含量和不同磁性能的氮化铁样品。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨率透射电子显微镜(HRTEM)、振动样品磁强计(VSM)和矢量网络分析仪(VNA)对样品进行表征。氮化铁样品是纳米结构的,颗粒内部含有大量界面、边界和缺陷。根据传输线理论,利用样品的电磁参数模拟电磁波反射损耗(RL)值。饱和磁化强度为 173 的样品。3 emu∙g-1 具有最佳 RL 值,在 17.93 GHz 时达到 -63.31 dB,厚度为 1.77 mm。Ms值大于90.9 emu∙g-1的样品可以有效吸收Ku波段的电磁波。吸收性能随着Ms值的降低而降低。讨论了通过高能球磨获得的纳米结构有利于提高 Ku 带中氮化铁样品的介电常数和磁导率。还分析了电磁波吸收机制。此外,该研究为工业化生产低成本的电磁波吸收材料提供了参考。吸收性能随着Ms值的降低而降低。讨论了通过高能球磨获得的纳米结构有利于提高 Ku 带中氮化铁样品的介电常数和磁导率。还分析了电磁波吸收机制。此外,该研究为工业化生产低成本的电磁波吸收材料提供了参考。吸收性能随着Ms值的降低而降低。讨论了通过高能球磨获得的纳米结构有利于提高 Ku 带中氮化铁样品的介电常数和磁导率。还分析了电磁波吸收机制。此外,该研究为工业化生产低成本的电磁波吸收材料提供了参考。
更新日期:2020-11-01
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