Compositions – Magnetic – Iron-oxygen compound containing
Patent
1981-04-03
1983-11-08
Cooper, Jack
Compositions
Magnetic
Iron-oxygen compound containing
252 6256, 252 6258, 252 6259, 252 626, 252 6262, 423594, C04B 3526
Patent
active
044141246
ABSTRACT:
Barium-ferrite series powders are prepared from an alkaline aqueous solution containing a prescribed ratio of ions of the metals equal to those contained in the powder. In the first stage, the alkaline aqueous solution is heated at a constant volume at 150.degree. to 300.degree. C. to precipitate a precursor of the barium-ferrite series powder. Then, the precursor is baked at 700.degree. to 1,000.degree. C. to crystallize the precursor.
REFERENCES:
patent: 3634254 (1972-01-01), Micheli
patent: 4025449 (1977-05-01), Pezzoli et al.
Awa Masashi
Endo Hiroshi
Hayashi Masaru
Hirate Naoyuki
Iiri Shigeo
Cooper Jack
Tokyo Shibaura Denki Kabushiki Kaisha
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