Abstract Fe3O4-SiO2 hybrid fibres were prepared by a combination of sol-gel and electro spinning techniques. The X-ray diffraction peaks of the fibres at 30.5, 35.5, 43.0, 57.0 and 62.6 correspond to the (220), (311), (400), (511) and (440) Fe3O4 planes and confirm the formation of Fe3O4 in the amorphous silica matrix. Si and Fe elemental mappings at the microstructural level were determined by scanning electron microscopy (SEM) with energy dispersive X-ray spectrometry (EDS). The results reveal the uniform distribution of Si and Fe in the hybrid fibres. The Fe3O4-SiO2 hybrid fibres are immersed in the test hydrochloric acid solution with pH=1 and still can be magnetized and attracted to an external magnet after 6 h in the solution. The heat- and flame-resistant performances of the hybrid fibres are demonstrated. Moreover, the prepared Fe3O4-SiO2 hybrid fibres display good microwave absorption performance in the range of relatively high frequencies. At a thickness of 5 mm, the bandwidth corresponding to reflection loss below −10 dB reaches approximately 11 GHz (7–18 GHz), covering the entire X-band (8.0–18.0 GHz) and Ku-band (12.0–18.0 GHz).

中文翻译：

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环境稳定性增强的原位合成Fe 3 O 4 -SiO 2 杂化纤维的微波吸收性能

摘要 采用溶胶-凝胶和电纺技术相结合的方法制备了Fe3O4-SiO2杂化纤维。纤维在 30.5、35.5、43.0、57.0 和 62.6 处的 X 射线衍射峰对应于 (220)、(311)、(400)、(511) 和 (440) Fe3O4 平面，并证实了 Fe3O4 在无定形二氧化硅基质。通过扫描电子显微镜 (SEM) 和能量色散 X 射线光谱法 (EDS) 确定微观结构水平的 Si 和 Fe 元素映射。结果表明，Si 和 Fe 在混合纤维中分布均匀。将 Fe3O4-SiO2 混合纤维浸入 pH=1 的试验盐酸溶液中，在溶液中 6 小时后仍可被磁化并被外部磁铁吸引。证明了混合纤维的耐热和阻燃性能。而且，制备的 Fe3O4-SiO2 混合纤维在较高频率范围内表现出良好的微波吸收性能。厚度为 5 mm 时，-10 dB 以下反射损耗对应的带宽达到约 11 GHz（7-18 GHz），覆盖整个 X 波段（8.0-18.0 GHz）和 Ku 波段（12.0-18.0 GHz） .