Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 335, Issue -, Pages 32-35Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2013.01.030
Keywords
Electromagnetic wave absorber; Sm2O3/alpha-Fe/Sm2Fe17N3 composite; Complex permittivity and permeability
Funding
- Doctoral Fund for New Teachers from the Ministry of Education of China [200806101020]
- National Natural Science Foundation of China [51104103]
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Sm2O3/alpha-Fe/Sm2Fe17Nx 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% Sm2O3, 64.4 wt% alpha-Fe and 10.3 wt% Sm2Fe17N3 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 Sm2O3/alpha-Fe/Sm2Fe17N3 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. (c) 2013 Elsevier B.V. All rights reserved.
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