Barium ferrite particles and process for producing said particles
AssigneeToda Kogyo Corporation
InventorsNorimichi Nagai, Nanao Horiishi, Masao Kiyama, Toshio Takada
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Abstract
Barium ferrite particles of a coercive force of not more than 1,000 Oe suitable for use as a magnetic material for magnetic recording and a process for producing said particles are disclosed herein.
Claims13
Barium ferrite particles in a form of plate-like having a specific surface area of 0.5 to 5.0 m.sup.2 /g, a maximum magnetization of 35 to 60 emu/g and a coercive force of not more than 1,000 Oe.
A process for producing barium ferrite particles in a form of plate-like, comprising subjecting an alkaline suspension containing acicular particles of .alpha.-FeO(OH) with a specific surface area of 10 to 25 m.sup.2 /g and barium ions to autoclaving at a temperature of 250.degree. to 360.degree. C.
Dependencies are inferred from the claim text.