PURPOSE: To obtain the magnetic powder of uniform-shaped hexagonal barium ferrite and Co-Ti substituted hexagonal barium ferrite by a methd wherein a coprecipitated substance is obtained by contacting ferric salt, barium salt and the like with the aqueous solution containing alkali of pH 10 or more, and said coprecipitated substance is dried up and annealing is performed.
CONSTITUTION: The coprecipitated substance is obtained by making an aqueous solution containing at least one or more of ferrite salt, barium salt and stron- tium salt and also containing metallic salts to be used for ion replacement, as occasion demands, come in contact with another aqueous solution which contains alkali of pH 12 or more. Then, after microwave heating has been performed on the above, the coprecipitated substance is washed clean, dried up, annealed, and the manufacture of the hexagonal ferrite powder is completed.
ANAMI TAKESHI
IDO TADASHI
MAEDA TATSUMI
