GHz Range Absorption Properties of ɛ ­ Fe3 N / Y 2 O 3 Nanocomposites Derived from Y 2Fe17 Intermetallic Compounds

The electromagnetic wave absorption properties of e-Fe 3 N/Y 2 O 3 nanocomposites were characterized in a frequency range of 0.05-20.05 GHz. The imaginary part of relative permeability μ" r exhibited two types of resonance mechanisms: the domain wall and spin rotational resonances, over a 0.5-10 GHz range. The real part (e' r ) and imaginary part (e" r ) of relative permittivity almost kept a low constant in a region of 0.5-10 GHz, respectively. As a result, the resin composites with 80 wt % e-Fe 3 N/Y 2 O 3 powders exhibited excellent electromagnetic wave absorption properties (RL < -20 dB) in a frequency range of 0.6-4.4 GHz, with thickness of 3.3-19.3 mm. A minimum reflection loss of -55 dB was observed at 1.8 GHz with an absorber thickness of 7.05 mm.

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