Compositions – Magnetic – Iron-oxygen compound containing
Patent
1986-07-14
1988-08-23
Garvin, Patrick P.
Compositions
Magnetic
Iron-oxygen compound containing
252 6263, 423594, C04B 3526, C01G 4902
Patent
active
047659203
ABSTRACT:
A method for producing fine magnetic particles having the barium or strotium ferrite M-phase crystal structure. An iron and alkaline earth metal halide feed solution is vaporized to form a precursor and oxidizing vapor phase. The precursor and hydrolyzing or oxidizing vapor phases are held in a reactor at a temperature sufficient to effect vaporization of the feed solution yet which is below the melting point of the desired M-phase crystal structure. Small iron oxide particles precipitate from the vapor phase and alkaline earth oxides thereafter. The alkaline earth oxide particles diffuse into the iron oxide particles to form the desired M-phase structure. When the desired width and thickness of the M-phase crystal platelets is achieved, the M-phase particles are cooled by quenching. Composition of the feed solution may be modified by substituting divalent metal halides for the alkaline earth metal halide or by substituting trivalent halides or a combination of a divalent metal halide and either a penta or quatravalent metal halide for the ferric halide.
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Gattuso Todd R.
Koehlert Kenneth C.
Neville Matthew
Reznek Steven R.
Senecal Joseph A.
Cabot Corporation
Fourson George R.
Garvin Patrick P.
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