Acicular ferromagnetic metal particles and method for preparatio

Details Acicular ferromagnetic metal particles and method for preparatio Acicular ferromagnetic metal particles and method for preparatio

1977-12-16

1979-01-09

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75251, 148 3155, 148105, H01F 106

Patent

active

041336763

ABSTRACT:
Acicular ferromagnetic metal particles having a particle size of 0.1 to 1 .mu.m and a dimension of crystallite-size of not more than about 215 A in the effective thickness of the crystallite in the direction perpendicular to the reflecting plane (110), which have a high coercive force, preferably not less than 1,400 oersteds and are useful for a high-density magnetic recording tape, video mother tape, or permanent magnet material, and a method for the preparation of the ferromagnetic metal particles comprising reducing with heating goethite particles which are prepared by treating a ferrous salt with a large amount of a basic agent, particularly an alkali metal hydroxide.

REFERENCES:
patent: 3206338 (1965-09-01), Miller et al.
patent: 3598568 (1971-08-01), Klomp et al.
patent: 3679398 (1972-07-01), Geus
patent: 4056410 (1977-11-01), Corradi et al.
patent: 4063000 (1977-12-01), Aonuma et al.

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