Preparation and electromagnetic wave absorption properties of Sm2O3/α-Fe/Sm2Fe17N composites

Abstract Sm 2 O 3 /α-Fe/Sm 2 Fe 17 N x composites were prepared in situ by hydrogenation–disproportionation–oxygen-desorption–recombination and nitrogen process, and their electromagnetic wave absorption properties were measured in the frequency range of 0.5–18 GHz. The result showed that saturation magnetization and coercivity of as-prepared powder with 25.3 wt% Sm 2 O 3 , 64.4 wt% α-Fe and 10.3 wt% Sm 2 Fe 17 N 3 were 134.57 emu/g and 654.5 G, respectively. The dielectric constant of composites was low over the frequency range of 0.5–18 GHz, and their resonance frequencies were at a high frequency range. The resin composite of Sm 2 O 3 /α-Fe/Sm 2 Fe 17 N 3 exhibited effective electromagnetic wave absorption ( RL ≤20 dB) in a frequency range 3–9 GHz, for absorber thickness ranging from 3 to 8 mm, respectively. A minimum reflection loss of −53 dB from the samples was observed at 7 GHz with an absorber thickness of 3.59 mm.