Process for producing microcrystalline barium ferrite platelets

Details Process for producing microcrystalline barium ferrite platelets Process for producing microcrystalline barium ferrite platelets

1989-05-30

1992-01-07

Lewis, Michael

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6263, 252 6262, 252 626, 252 6256, 252 6259, 252 6258, C01G 4900, C04B 3526, C04B 3564

Patent

active

050789848

ABSTRACT:
A process for producing microcrystalline barium ferrite platelets which comprises: forming an aqueous alkaline dispersion containing coprecipitates of hydroxides of barium ions, iron (III) ions, and optionally ions of a substituent element; heating the dispersion to a temperature of not less than 50.degree. C. and not more than the boiling point of the dispersion under an atmospheric pressure to convert the coprecipitates to precursors of the barium ferrite; calcining the precursors to provide microcrystalline barium ferrite platelets; the improvement comprising the step of adding a carbonating agent such as sodium carbonate to the aqueous alkaline dispersion before or after the heating of the aqueous dispersion to insolubilize water soluble barium ions therein, and the step of calcining the barium ferrite precursors in the presnece of sodium sulfate at temperatures of 700.degree.-900.degree. C., to provide microcrystalline barium ferrite platelets of about 0.03-0.1 .mu.m in average particle size and 2-5 in planarity ratio.

REFERENCES:
patent: 4401643 (1983-08-01), Hibst
patent: 4414124 (1983-11-01), Endo
patent: 4664831 (1987-05-01), Hibst

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