IRON-BASED OXIDE MAGNETIC POWDER AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2021/200481

A1

[Problem] To provide an iron-based oxide magnetic powder having good thermal stability, showing little change in the amount of radiowave absorption even in a high-temperature environment, and made of particles of ε-ferric oxide in which some of Fe-sites are substituted by another metal element, a radiowave absorber using the iron-based oxide magnetic powder, a green body in which the iron-based oxide magnetic powder is used, and a method for manufacturing the same. [Solution] A phosphorus-containing ion is caused to co-exist when a deposit of a hydrous ferric oxide including a substitute metal element generated by neutralizing an acidic aqueous solution including a trivalent iron ion and a metal ion substituting some of Fe-sites is coated with a silicon oxide using a silane compound, whereby it is possible to obtain an iron-based oxide magnetic powder having good thermal stability, showing little change in the amount of radiowave absorption even in a high-temperature environment, and made of particles of ε-ferric oxide in which some of Fe-sites are substituted by another metal element.

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

PCT/JP2021/012268

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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