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Structural Magnetic and Microwave Characterization of Polycrystalline Z-Type Sr3Co2Fe24O41 Hexaferrite

机译:Z型Sr3Co2Fe24O41六方铁氧体多晶的结构磁和微波表征

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摘要

We report results on the structural and microwave properties and magnetic phase transitions in polycrystalline Sr Co Fe O hexaferrite synthesized by sol-gel auto-combustion and acting as a filler in a composite microwave absorbing material. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves revealed a change in the magnetization behavior at 293 K. The reflection losses in the 1–20 GHz range of the Sr Co Fe O powder dispersed homogeneously in a polymer matrix of silicon rubber were investigated in both the absence and presence of a magnetic field. In the latter case, a dramatic rise in the attenuation was observed. The microwave reflection losses reached the maximum value of 32.63 dB at 17.29 GHz in the Ku-band. The sensitivity of the microwave properties of the composite material to the external magnetic field was manifested by the appearance of new reflection losses maxima. At a fixed thickness of the composite, the attenuation peak frequency can be adjusted to a certain value either by changing the filling density or by applying an external magnetic field.
机译:我们报告了通过溶胶-凝胶自动燃烧合成并在复合微波吸收材料中充当填充剂的多晶Sr Co Fe O六铁氧体的结构和微波性质以及磁相变的结果。零场冷(ZFC)和场冷(FC)磁化曲线显示在293 K时磁化行为发生了变化。SrCo Fe O粉末在1–20 GHz范围内的反射损耗均匀地分散在在有无磁场的情况下研究了硅橡胶的聚合物基体。在后一种情况下,观察到衰减显着上升。在Ku频段中,微波反射损耗在17.29 GHz时达到最大值32.63 dB。复合材料微波特性对外部磁场的敏感性通过出现新的最大反射损耗来体现。在复合材料的固定厚度下,可以通过更改填充密度或通过施加外部磁场将衰减峰值频率调整为某个值。

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