Spinel-type spherical, black iron oxide particles and process fo

Details Spinel-type spherical, black iron oxide particles and process fo Spinel-type spherical, black iron oxide particles and process fo

1993-08-10

1994-08-09

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

423594, C04B 3526

Patent

active

053364210

ABSTRACT:
Disclosed herein are spinel-type spherical black iron oxide particles containing 1.5 to 17.0 wt % of Zn, and having a specific surface area of 5 to 15 m.sup.2 /g, a magnetization of not less than 70 emu/g in an external magnetic field of 1 kOe and a coercive force (Hc) of not more than the value obtained from the following expression:

REFERENCES:
patent: 3822210 (1974-07-01), Iwase et al.
patent: 4680130 (1987-07-01), Hibst
patent: 4992191 (1991-01-01), Mori et al.

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