Magnetic recording powder, method of manufacturing thereof and a

Details Magnetic recording powder, method of manufacturing thereof and a Magnetic recording powder, method of manufacturing thereof and a

1985-03-26

1987-10-13

Lesmes, George F.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

252 6263, 423155, 428402, 428694, 428900, C01F 1146, C01G 4902, C04B 3526

Patent

active

046997717

ABSTRACT:
A matnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powder to a water insoluble compound such as BaSO.sub.4 or BaS.sub.2 O.sub.7. There is also proposed a magnetic recording medium having a magnetic layer containing such a magnetic powder as mentioned above.

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patent: 4552808 (1985-11-01), Fujiyama et al.
patent: 4565726 (1986-01-01), Oguchi et al.

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