Method for preparation of magnetic spinel ferrites from...

Details Method for preparation of magnetic spinel ferrites from... Method for preparation of magnetic spinel ferrites from...

2007-06-19

2007-06-19

Vandy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S594200, C423S599000, C423S594140, C423S594300, C423S594400, C423S594160, C423S594500, C423S594600, C252S062560, C252S062640

Reexamination Certificate

active

11040533

ABSTRACT:
The invention describes a method of preparing magnetic ferrites from layered precursors in which Fe2+is first introduced into the layers of layered double hydroxides (LDHs) in order to prepare Me-Fe2+—Fe3+LDHs, and then by utilizing the easily oxidized nature of Fe2+, binary or multi-component ferrite materials containing Fe3+in a single crystalline phase can be prepared. Values of the saturation magnetization of ferrites prepared by the method are significantly increased compared with ferrites prepared by traditional methods. Because the metal elements in the layered precursor have the characteristics of a high degree of dispersion, high activity and small particle size (average particle size 40-200 nm), no milling is required before calcination, thus simplifying the production process, shortening the production period, reducing capital investment in equipment and economizing on energy costs. In addition, the method does not corrode production equipment and does not pollute the environment.

REFERENCES:
patent: 4677082 (1987-06-01), Alford et al.
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patent: 5538657 (1996-07-01), Ogata et al.
patent: 5698131 (1997-12-01), Saitou et al.
patent: 5750045 (1998-05-01), Nihira et al.
patent: 1413945 (2003-04-01), None
PCT International Search Report dated Nov. 13, 2003.

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