Magnetic iron oxide particles, a process for producing the same

Details Magnetic iron oxide particles, a process for producing the same Magnetic iron oxide particles, a process for producing the same

1993-01-28

1995-09-12

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

428403, 106403, 106456, 148105, 252 6256, 423594, 423633, 427216, 427217, G11B 516

Patent

active

054495652

ABSTRACT:
Disclosed herein are magnetic composite iron oxide particles comprising spinel-type Fe.sub.3 O.sub.4 particles as core particles and spinel-type CoFe.sub.2 O.sub.4 outerlayer of the composite iron oxide particles, a process for producing the same, and a magnetic recording medium comprising a substrate and a magnetic recording layer containing the said magnetic iron oxide particles.

REFERENCES:
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patent: 4876022 (1989-10-01), Yamazaki et al.
patent: 4923519 (1990-05-01), Rodi et al.
patent: 5188898 (1993-02-01), Tagawa et al.
Chemical Abstracts, vol. 116, No. 2, Jan. 13, 1992, Columbus, Ohio; Ohashi et al.: "Synthesis of magnetite and analogous spinel-type iron oxides and their characterization," p. 553, col. 2.
Chemical Abstracts, vol. 91, No. 27, Dec. 10, 1979, Columbus, Ohio, Baszynski et al.: "Domain structure and magnetic anistropy in mono-crystalline epilayer of ferrite with spinel structure," p. 707, col. 2.
Chemical Abstracts, vol. 83, No. 14, Oct. 6, 1975, Columbus, Ohio, Oudet: "Crystal structure and saturation magnetic moment at 0 degree K spinel ferrites RFe204 (R=metal)," p. 761, col. 2.
Chemical Abstracts, vol. 87, No. 6, Aug. 8, 1977, Columbus, Ohio, Mollard et al.: "Physico-chemical properties of new particles of sold solutions between iron sesquinoxide and divalent spinel ferrites for magnetic recording," p. 567, col. 1.
Chemical Abstracts, vol. 88, No. 14, Apr. 3, 1978, Columbus, Ohio, Kiyama: "The formation of manganese and cobalt ferrites by the air oxidation of aqueous suspension and their properties," p. 602, col. 1.
Chemical Abstracts, vol. 100, No. 22, May 28, 1984, Columbus, Ohio, Kiselev et al.: "Calculation and prediction of composition-property dependences for multicomponent solid solutions. II. Deviation of fundamental ratios for spinel solutions," p. 557, col. 2.

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