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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >GHz microwave properties of melt spun Fe-Si alloys
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GHz microwave properties of melt spun Fe-Si alloys

机译：熔纺铁硅合金的GHz微波特性

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摘要

The structural and microwave properties of melt spun Fe100-xSix (x = 10, 20, 30) nanocomposites were investigated. The phases varied with Si content in FeSi alloys. it is found that the Fe3Si and FeSi phases could be obtained with Si content up to 20 at.%. The X-ray absorption fine structure (XAFS) spectra of Fe K-edges show that the local structures around Fe atoms in melt spun Fe-Si alloys become more disordered with increasing Si content when compared with that of alpha-Fe. The complex permittivity-frequency and permeability-frequency properties were determined in the microwave frequency regime of 2-18 GHz by vector network analysis. It is found that flake-like FeSi powder composite has the largest values of mu' and mu '' at 2 GHz. The reflection loss shifts to the higher frequency with the Si content increasing for melt spun FeSi alloys. A minimum reflection loss of -16.5 dB is obtained at 13.9 GHz for composition Fe70Si30 With the thickness of 1.5 mm. However, for composition Fe70Si30, the minimum reflection loss shifts to lower frequency and larger value with the thickness increasing. The results suggest a new design for microwave absorbers based on electromagnetic wave-absorbing materials.
机译：研究了熔纺Fe100-xSix（x = 10、20、30）纳米复合材料的结构和微波性能。 FeSi合金中的相随Si含量而变化。发现可以得到Si含量高达20at。％的Fe3Si和FeSi相。 Fe K边缘的X射线吸收精细结构（XAFS）光谱显示，与α-Fe相比，熔纺Fe-Si合金中Fe原子周围的局部结构随着Si含量的增加变得更加无序。通过矢量网络分析，在2-18 GHz的微波频率范围内确定了介电常数-频率和磁导率-频率特性。发现片状FeSi粉末复合材料在2 GHz下具有最大的mu'和mu''值。对于熔融纺制的FeSi合金，随着Si含量的增加，反射损耗移向更高的频率。对于厚度为1.5 mm的成分Fe70Si30，在13.9 GHz处获得的最小反射损耗为-16.5 dB。然而，对于成分Fe70Si30，随着厚度的增加，最小的反射损耗会转移到较低的频率和较大的值。结果提出了一种基于电磁波吸收材料的微波吸收器的新设计。

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