IRON-BASED OXIDE MAGNETIC PARTICLE POWDER AND METHOD FOR PRODUCING IRON-BASED OXIDE MAGNETIC PARTICLE POWDER

WIPO Patent Application WO/2016/047559

A1

[Problem] To provide an iron-based oxide magnetic particle powder suitable for achieving higher-density recording with respect to a magnetic recording medium, and a method for producing such powder, with which the particle size distribution is narrow, the content of microparticles that do not contribute to magnetic recording properties is small, and, as a result, the coercivity distribution is narrow. [Solution] An ε-type iron-based oxide magnetic particle powder containing a substituted metal element is obtained by adding alkali to an aqueous solution containing trivalent iron ions and metal ions partially substituting Fe sites, neutralizing the pH to a pH of 1.5 to 2.5, thereafter adding hydroxycarboxylic acid, further adding alkali to neutralize the pH to a pH of 8.0 to 9.0, washing a generated precipitate of iron oxyhydroxide containing a substituted metal element, and thereafter covering the iron oxyhydroxide containing the substituted metal element with silicon oxide and heating the same.

JPS6291426	MAGNETIC POWDER FOR MAGNETIC RECORDING
JP4820988	Magnetic fine particles and their manufacturing methods and magnets using them and their manufacturing methods

SAKANE KENJI (JP)
KAWAHITO TETSUYA (JP)

PCT/JP2015/076525

March 31, 2016

September 17, 2015

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DOWA ELECTRONICS MATERIALS CO (JP)

H01F1/11; C01G49/00; C01G51/00; G11B5/706; G11B5/712; G11B5/714; G11B5/84; G11B5/842

WO2008149785A1	2008-12-11
WO2014175387A1	2014-10-30

JP2008100871A	2008-05-01
JP2008174405A	2008-07-31
JP2011032496A	2011-02-17

KOMATSU TAKASHI (JP)
Komatsu Quantity (JP)

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