Compositions – Magnetic – Iron-oxygen compound containing
Patent
1994-04-19
1995-07-18
Bell, Mark L.
Compositions
Magnetic
Iron-oxygen compound containing
423594, C04B 3526
Patent
active
054338786
ABSTRACT:
A method for producing fine particles of barium ferrite, which comprises reacting an aqueous solution comprising an iron compound, a barium compound and an alkaline substance, wherein the molar ratio of hydroxyl groups of the alkaline substance to the total of anions of the iron compound and the barium compound in the aqueous solution is from 1 to 4, and the reaction is carried out at a temperature of at least 250.degree. C. under a pressure of at least 200 kg/cm.sup.2 using a flow type reactor.
REFERENCES:
The Abstracts of Presentations at the Meeting of the Society of Chemical Engineering in Yonezawa, pp. 158-159, Jul. 23-24, 1991, "Production of Fine Particles of Metal Oxide in Supercritical Water".
The Abstract of Presentations at the Meeting of The Society of Chemical Engineering in Akita, Aug. 3-4, 1993, pp. 36-37, "Synthesis of Barium Ferrite in Supercritical or Subcritical Water".
The Reports on Project Researches, vol. 2, (published by The Special Society for the Research of Crystallization Technique in Chemical Engineering), Nov. 1993, 11 pages.
Ajiri Tadafumi
Arai Kunio
Ota Isao
Yuki Shin-ichi
Bell Mark L.
Bonner C. M.
Nissan Chemical Industries Ltd.
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