Method of producing single crystalline, acicular .alpha.-ferric

Details Method of producing single crystalline, acicular .alpha.-ferric Method of producing single crystalline, acicular .alpha.-ferric

1981-11-18

1983-11-08

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423632, 423634, C01G 4906

Patent

active

044141963

ABSTRACT:
A method of producing single crystalline, acicular .alpha.-ferric oxide particles of narrow particle size distribution is provided. The method comprises heating an aqueous suspension of ferric hydroxide at temperatures of 100.degree.-250.degree. C. at an alkaline pH in the presence both a water soluble organic or inorganic compound capable of forming complexes with iron as a growth regulating agent and .alpha.-ferric oxide seed crystals of minor axes not larger than 0.4 microns in average in amounts of 0.1-25 mole % in terms of the Fe content thereof in relation to the ferric hydroxide.

REFERENCES:
patent: 3252758 (1966-05-01), Hoch et al.
patent: 3262755 (1966-07-01), Steinmetz et al.
patent: 3845198 (1974-10-01), Marcot
patent: 4202871 (1980-05-01), Matsumoto et al.

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