Microwave-absorbing samples were fabricated using carbon black powder, super-paramagnetic Zn 0.8 Ni 0.2 Fe 2 O 4 nanoparticles dispersed in a SiO 2 matrix, epoxy resin, and hardener. The paint was then coated onto a steel substrate. The effects of super-paramagnetic Zn 0.8 Ni 0.2 Fe 2 O 4 nanoparticles content (0–1.75 wt%) and different coating thickness (1–2.5 mm) on microwave absorption ability in the X-band frequency range (8–12 GHz) have been studied. The results showed that paint sample containing only carbon black (20 wt%) and epoxy resin (80 wt%) expressed low microwave absorption ability at 10 GHz centered frequency (≈ 67% absorption percentage). The super-paramagnetic Zn 0.8 Ni 0.2 Fe 2 O 4 nanoparticles strongly affected the microwave-absorbing ability. A sample of 1.5 wt% super-paramagnetic Zn 0.8 Ni 0.2 Fe 2 O 4 nanoparticles content exhibited highest microwave absorption at 10 GHz centered frequency (≈ 99% power attenuation). Higher coating thicknesses (1–2.5 mm) led to greater microwave absorption and reached a very high absorption of 2 mm thickness (≈ 99% absorption percentage at 10 GHz centered frequency).

中文翻译：

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超顺磁性锌镍铁氧体纳米颗粒在 8-12 GHz 频率范围内的微波吸收特性

使用炭黑粉末、分散在 SiO 2 基质中的超顺磁性 Zn 0.8 Ni 0.2 Fe 2 O 4 纳米颗粒、环氧树脂和硬化剂制造微波吸收样品。然后将涂料涂在钢基材上。超顺磁性Zn 0.8 Ni 0.2 Fe 2 O 4 纳米颗粒含量（0-1.75 wt%）和不同涂层厚度（1-2.5 mm）对X波段频率范围（8-12 GHz）微波吸收能力的影响已被研究。结果表明，仅含有炭黑 (20 wt%) 和环氧树脂 (80 wt%) 的涂料样品在 10 GHz 中心频率下表现出较低的微波吸收能力（≈ 67% 吸收百分比）。超顺磁性Zn 0.8 Ni 0.2 Fe 2 O 4 纳米粒子强烈影响微波吸收能力。1.5 wt% 超顺磁性 Zn 0.8 Ni 0 样品。2 Fe 2 O 4 纳米颗粒含量在 10 GHz 中心频率下表现出最高的微波吸收（≈ 99% 功率衰减）。更高的涂层厚度（1-2.5 毫米）导致更大的微波吸收，并达到 2 毫米厚度的非常高的吸收（在 10 GHz 中心频率下吸收百分比约为 99%）。