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Materials Transactions, Vol.42 No.3 (2001) pp.446-449
© 2001 The Japan Institute of Metals

Electromagnetic Microwave Absorption Properties of a Fine Structure Formed from the Sm₂Fe₁₇ Compound after Disproportionation in Air or Nitrogen^*

Department of Material Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

It was reported in our previous papers that the disproportionation reaction of the Sm₂Fe₁₇ compound in hydrogen can be used to prepare fine, soft-magnetic powders for use in electromagnetic wave absorbers. In this study, the microstructure and electromagnetic wave absorption properties in the GHz frequency range of Sm₂Fe₁₇ powders, disproportionated in air or nitrogen atmospheres, were investigated. A fine α -Fe structure, of sub-micron order size, is formed from the Sm₂Fe₁₇ compound after disproportionation in either air or nitrogen. In the case of disproportionation in air, the powder treated at 423-573 K was in a α -Fe/SmO two-phase state. While in the case of disproportionation in nitrogen, the powder treated at 923 K showed α -Fe/SmN two-phase state; this powder then had to be heated at 423-523 K in air in order to oxidize the SmN phase. Epoxy-resin composite samples were made from these powders, and their electromagnetic wave absorption properties were measured. It was found that the sample disproportionated at 923 K for 2 hours in a nitrogen gas flow, milled for 30 minutes and oxidized at 523 K for 2 hours in air, exhibited the best absorption properties. The R.L. value was under -20 dB in the frequency range 1.2 to 2.3 GHz, when the absorber thickness was between 7.2 to 4.2 mm. Therefore, compared with a carbonyl-iron/resin composite (which had the same Fe content), the absorber was 30% thinner.

(Received October 27, 2000; Accepted January 22, 2001)

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Unique birthday candles for cakes. Keywords: electromagnetic wave absorber, samarium-iron compound, disproportionation reaction, oxidation, nitriding, α -Fe fine structure, epoxy resin composite, complex relative permeability, reflection loss

^*This Paper was Presented at the Fall Meeting of the Japan. Institute of Metals, held in Nagoya, on October 2, 2000.
^**Graduate Student, Tohoku University.
^***EMC Lab. Co., Ltd., Sendai 980-3204, Japan.

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