Magnetite particles and process for production thereof

Details Magnetite particles and process for production thereof Magnetite particles and process for production thereof

1998-09-22

2000-01-11

Koslow, C. Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6262, 252 626, 252 6264, 252 6258, 252 6257, C01G 4908, G03G 9083, H01F 111

Patent

active

060131934

ABSTRACT:
Magnetite particles continuously containing 0.2 to 1.0 wt. %, based on magnetite, of a silicon component expressed as silicon, in a region ranging from the center to the surface of the particle; 0.01 to 0.3 wt. % of the silicon component being exposed on the surface of the particle; and an outer shell of the particle being coated with a metal compound comprising at least one metal component bound to the silicon component, the metal component being selected from the group consisting of Zn, Mn, Cu, Ni, Co, Cr, Cd, Al, Sn, Mg, Ti and Ce, and a process for preparing the particles.

REFERENCES:
patent: 5356712 (1994-10-01), Hashiuchi et al.
patent: 5663026 (1997-09-01), Kasuya et al.
patent: 5759435 (1998-06-01), Miyazono et al.

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