Magnetic ceramic composition for use in microwave devices, magne

Details Magnetic ceramic composition for use in microwave devices, magne Magnetic ceramic composition for use in microwave devices, magne

1997-07-31

1999-05-11

Koslow, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6263, 252 6258, C04B35/26

Patent

active

059025140

ABSTRACT:
A material for microwave band devices used by the general people and in industrial electronic apparatuses is disclosed. Particularly, a magnetic ceramic composition for use in microwave devices, a magnetic ceramics for use in microwave devices and a preparation method therefore are disclosed, in which the saturation magnetization can be easily controlled, and a low ferri-magnetic resonance half line width and an acceptable curie temperature are ensured. The magnetic ceramic composition for microwave devices includes yttrium oxide (Y.sub.2 O.sub.3), iron oxide (Fe.sub.2 O.sub.3), tin oxide (SnO.sub.2), aluminum oxide (Al.sub.2 O.sub.3) and a calcium supply source. The magnetic ceramics for the microwave devices are manufactured by carrying out a forming and a sintering after mixing: yttrium oxide, iron oxide, tin oxide, aluminum oxide and calcium carbonate (or calcium oxide) based on a formula shown below. It has a saturation magnetization of 100-1,800 G at the normal temperature, a temperature coefficient for the saturation magnetization of 0.2%/.degree.C., and a ferri-magnetic resonance half line width of less than 60 Oe, Y.sub.3-x Ca.sub.x/2 Sn.sub.x/2 Fe.sub.5-y Al.sub.y O.sub.12 where 0.1.ltoreq.x.ltoreq.1, and 0.1.ltoreq.y.ltoreq.1.5.

REFERENCES:
patent: 3006855 (1961-10-01), Geller
patent: 3657131 (1972-04-01), Lagrange et al.
patent: 3886077 (1975-05-01), Nicolas et al.
patent: 5589096 (1996-12-01), Konoike et al.

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