Process for producing magnetic FE oxide

Details Process for producing magnetic FE oxide Process for producing magnetic FE oxide

1977-12-21

1979-12-18

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6257, 252 6259, 252 626, 252 6262, 252 6263, 252 6264, C04B 3526, C01G 4906, C01G 4908

Patent

active

041793870

ABSTRACT:
A magnetic Fe oxide containing Co, and optionally, a divalent metal, in which the oxidation degree indicated by the following formula ranges from about 30% to 80%; ##EQU1## wherein y is the amount of the Co, plus the divalent metal if present, in atomic % contained in the magnetic Fe oxide, and R is the ratio of the divalent Fe ion to the total Fe ions;
and a process for producing a magnetic Fe oxide containing Co, and optionally, a divalent metal, and having an oxidizing degree of about 30 to 80%, which comprises dehydrating and reducing goethite containing Co, and optionally, the divalent metal, to obtain magnetic containing Co, and optionally, a divalent metal, and oxidizing gradually the magnetite at a relatively low temperature of lower than about 100.degree. C.

REFERENCES:
patent: 2689167 (1954-09-01), Dovey et al.
patent: 3720618 (1973-03-01), Toda et al.
patent: 3748270 (1973-07-01), Hwang
Imaoka et al., "Ferrites:Proc. of the International Conf.," Jul. 1970, Japan, pp. 467-470.

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