Compositions – Magnetic – Iron-oxygen compound containing
Patent
1984-09-06
1985-04-23
Cooper, Jack
Compositions
Magnetic
Iron-oxygen compound containing
423594, C04B 3526
Patent
active
045129061
ABSTRACT:
Fine particles of a ferrite having the magnetoplumbite structure are prepared by hydrothermal treatment of .gamma.-Fe.sub.2 O.sub.3 and at least one compound of a divalent metal selected from Ba, Sr and Pb in an aqueous alkali solution, preferably at 80.degree.-360.degree. C. This process is suitable for preparation of hexagonal and thin plate-shaped particles of the ferrite and is advantageous in consuming only a small quantity of alkali. Alternative to .gamma.-Fe.sub.2 O.sub.3, it is possible to use either Fe.sub.3 O.sub.4 or an intermediate iron oxide expressed by (FeO).sub.x.Fe.sub.2 O.sub.3, where O<x<1, as the starting iron oxide with the addition of an oxidizer to the hydrothermal reaction system to cause oxidation of the starting iron oxide to .gamma.-Fe.sub.2 O.sub.3 during an initial stage of the hydrothermal treatment.
REFERENCES:
patent: 3723587 (1973-03-01), Iwase et al.
patent: 3855374 (1974-12-01), Brailowsky
patent: 3895092 (1975-07-01), Sironi et al.
patent: 4279763 (1981-07-01), Boeuf et al.
"Structural and Magnetic Studies of Hydrothermally Synthesized New Ferrites"; Professor S. Okamoto; Research Bulletin of Nagaoka Institute of Science and Technology; No. 4 (1982).
Hayakawa Masanori
Nishimura Satoshi
Central Glass Company Limited
Cooper Jack
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