IRON-BASED OXIDE MAGNETIC POWDER, AND POWDER COMPACT AND RADIO WAVE ABSORBER USING SAME

WIPO Patent Application WO/2021/200482

A1

[Problem] To provide: an iron-based oxide magnetic powder which has good thermal stability and a small change in a radio wave absorption amount even in a high temperature environment, and is formed of ε-iron oxide particles in which a part of Fe sites is substituted with other metal elements; a radio wave absorber using the iron-based oxide magnetic powder; a powder compact using the iron-based oxide magnetic powder; and a production method thereof. [Solution] This iron-based oxide magnetic powder, which has good thermal stability and a small change in a radio wave absorption amount even in a high temperature environment, and is formed of ε-iron oxide particles in which a part of Fe sites is substituted with other metal elements, can be obtained by making, when coating a silicon oxide with a silane compound, phosphorus-containing ions coexist in a precipitate of iron hydroxide containing a substituted metal element produced by neutralizing an acidic aqueous solution containing trivalent iron ions and metal ions that partially substitute the Fe sites.

OHKOSHI SHIN-ICHI (JP)
NAMAI ASUKA (JP)
YOSHIKIYO MARIE (JP)
KODAMA DAISUKE (JP)
HORI TATSURO (JP)
GOTOH MASAHIRO (JP)

PCT/JP2021/012269

October 07, 2021

March 24, 2021

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UNIV TOKYO (JP)
DOWA ELECTRONICS MATERIALS CO (JP)

H01F1/11; C01G49/00; G11B5/706; H05K9/00

WO2008149785A1

2008-12-11

JP2018056354A	2018-04-05
JP2019145534A	2019-08-29
JP2002296202A	2002-10-09
JP2020126942A	2020-08-20

KOMATSU Takashi (JP)

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