Magnetite particles and process for preparing the same

Details Magnetite particles and process for preparing the same Magnetite particles and process for preparing the same

1995-08-04

1996-09-17

Bonner, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6259, 252 6262, 106456, 106457, 106459, 428403, H01F 111, H01F 136

Patent

active

055565719

ABSTRACT:
There are provided magnetite particles characterized in that they have surfaces each covered with a thin film or iron-zinc oxides or further covered thereon with a thin film of iron-silicon oxides and have a saturation magnetization of at least 79 emu/g, a degree of blackness (L) of at most 19.5 as measured with a differential colorimeter, and an absorption of at least 30 ml/100 g as measured according to JIS K 5101. There is also provided a process for preparing magnetite particles as described above.

REFERENCES:
patent: 4342589 (1982-08-01), Ohshima et al.
patent: 5041307 (1991-08-01), Koyama et al.
patent: 5124207 (1992-06-01), Hayashi et al.

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