Method of making ferroelectric-ferromagnetic composite materials

Details Method of making ferroelectric-ferromagnetic composite materials Method of making ferroelectric-ferromagnetic composite materials

1996-04-01

1997-02-11

Bonner, Melissa

Compositions

Piezoelectric

252 626, 501135, 501136, 501137, C04B 3526, C04B 35465, C04B 35468, C04B 3547

Patent

active

056017480

ABSTRACT:
Barium-strontium titanate ferroelectric materials and AFe.sub.2 O.sub.4 -type ferrite ferromagnetic materials may be consolidated into a ferroelectric-ferromagnetic composite having useful electromagnetic interference attenuation properties over a wide range of electromagnetic frequencies by fluxing the barium-strontium titanate with a combination of (1) a lithium compound and barium oxide or (2) copper oxide and barium oxide and thereafter mixing the fluxed ferroelectric with the ferromagnetic and sintering the combination at reduced temperature in the range of 1060.degree. C. to 1150.degree. C.

REFERENCES:
patent: 4082906 (1978-04-01), Amin et al.
patent: 5512196 (1996-04-01), Mantese et al.
Chem. Abstract 80:114058, Japanese patent 48-95596.
Bultitude et al, "Development of Low-Fire Environment Friendly Dielectric Compositions for Multilayer Capacitors," Ceramic Transactions, 32 (1992), pp. 177-190.
Haussonne et al, "Barium Titanate Perovskite Sintered with Lithium Fluoride," Journal of the American Ceramic Society, vol. 66, No. 11, Nov. 1983, pp. 801-807.
Tolino et al, "Effect of Ba:Ti Ratio on Densification of LiF-Fluxed BaTiO.sub.3, " Communications of the American Ceramic Society, vol. 68, No. 11, Nov. 1985, pp. C-292-C-294.
Walker, Jr. et al, "Densification and Strength of BaTiO.sub.3 with LiF and MgO Additives," Ceramic Bulletin, vol. 55, No. 3 (1976), pp. 274-285.
Yang et al, "A New Sintering Agent for BaTiO.sub.3 : The Binary BaO--CuO System," Journal of Materials Science Letters, 11 (1992), pp. 1246-1248.

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