Abstract BaFe12O19/Ni0.5Co0.5Fe2O4 (H/S) as magnetic composite powder and subsequently carbon foam decorated with BaFe12O19/Ni0.5Co0.5Fe2O4 (H/S@CF) nanocomposites were prepared using one-step sol–gel and dip coating methods, respectively. Phase structures, morphology, magnetic and electromagnetic properties were evaluated using X-ray diffraction (XRD), Field emission electron microscopy (FESEM), vibrating sample magnetometer (VSM) and vector network analyzer (VNA) respectively. According to the results, through XRD analysis, presence of pure barium hexaferrite, spinel ferrite and carbon are revealed. Rietveld refinement was also done to evaluate the phases in the prepared nanocomposites. FESEM analysis depicted the honey comb like structure of H/S@CF sample. Based on electromagnetic measurements, smooth and continuous behavior for permittivity and permeability of H/S@CF composite revealed strong interfacial polarization and migration of charges in the direction of field. The minimum reflection loss of H/S@CF nanocomposite was − 45 dB at a matching frequency of 12.4 GHz, and the effective bandwidth under − 10 dB was 4 GHz with a thickness of 2 mm. The excellent microwave absorption performances of H/S@CF nanocomposite may be ascribed because of the less dielectric, magnetic losses and high dielectric properties. H/S@CF nanocomposite is expected to be a suitable candidate for aeronautic and aerospace fields because of low cost, lightweight and better microwave absorbing material.

中文翻译：

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BaFe12O19和Ni0.5Co0.5Fe2O4磁性复合材料装饰的碳泡沫X波段微波吸收特性

摘要 BaFe12O19/Ni0.5Co0.5Fe2O4 (H/S)作为磁性复合粉末，随后使用一步溶胶-凝胶和浸涂法制备了装饰有 BaFe12O19/Ni0.5Co0.5Fe2O4 (H/S@CF)纳米复合材料的碳泡沫方法，分别。分别使用 X 射线衍射 (XRD)、场发射电子显微镜 (FESEM)、振动样品磁强计 (VSM) 和矢量网络分析仪 (VNA) 评估相结构、形貌、磁性和电磁性能。根据结果​​，通过XRD分析，揭示了纯六铁酸钡、尖晶石铁氧体和碳的存在。还进行了 Rietveld 细化以评估制备的纳米复合材料中的相。FESEM 分析描绘了 H/S@CF 样品的蜂窝状结构。根据电磁测量，H/S@CF 复合材料的介电常数和渗透率的平滑和连续行为显示出强烈的界面极化和电荷在场方向上的迁移。H/S@CF纳米复合材料在12.4 GHz匹配频率下的最小反射损耗为- 45 dB，- 10 dB下的有效带宽为4 GHz，厚度为2 mm。H/S@CF纳米复合材料优异的微波吸收性能可能归因于其介电损耗、磁损耗小和介电性能高。H/S@CF纳米复合材料由于成本低、重量轻、吸波性能更好，有望成为航空航天领域的合适候选材料。H/S@CF纳米复合材料在12.4 GHz匹配频率下的最小反射损耗为- 45 dB，- 10 dB下的有效带宽为4 GHz，厚度为2 mm。H/S@CF纳米复合材料优异的微波吸收性能可能归因于其介电损耗、磁损耗小和介电性能高。H/S@CF纳米复合材料由于成本低、重量轻、吸波性能更好，有望成为航空航天领域的合适候选材料。H/S@CF纳米复合材料在12.4 GHz匹配频率下的最小反射损耗为- 45 dB，- 10 dB下的有效带宽为4 GHz，厚度为2 mm。H/S@CF纳米复合材料优异的微波吸收性能可能归因于其介电损耗、磁损耗小和介电性能高。H/S@CF纳米复合材料由于成本低、重量轻、吸波性能更好，有望成为航空航天领域的合适候选材料。