Dielectric ceramic composition for boundary layer condensers and

Details Dielectric ceramic composition for boundary layer condensers and Dielectric ceramic composition for boundary layer condensers and

1995-04-19

1997-01-28

Jones, Deborah

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501 21, 501 38, C04B 3546, C03C 1400

Patent

active

055977693

ABSTRACT:
A dielectric ceramic composition having an empirical formula represented by (Sr.sub.l-2x Bi.sub.x Ti.sub.l-y W.sub.y)O.sub.3 wherein x is in a range of 0.0005 to 0.003 and y is in a range of 0.0015 to 0.009 for boundary layer condensers and a method for preparing the same which are comprising the steps of: mixing Bi.sub.2 O.sub.3 -WO.sub.3 frit powder with main component having an empirical formula represented by Sr.sub.l-2x Ti.sub.l-y O.sub.3 wherein x is in a range of 0.0005 to 0.003 and y is in a range of 0.0015 to 0.009, in a wet manner, the Bi.sub.2 O.sub.3 frit serving as a reducing agent; drying the resulting mixture; sintering the dried mixture at a temperature of 1,400 to 1,470.degree. C under a reducing atmosphere; and applying secondary thermal treatment to the sintered body at 1,250.degree. C are disclosed.

REFERENCES:
patent: 4388416 (1983-06-01), Sakabe et al.
patent: 4405479 (1983-09-01), Murase et al.
patent: 4900702 (1990-02-01), Tduboi et al.
patent: 4978646 (1990-12-01), Bardham et al.
Kenton Derek Budd, "Procssing and Properties of Tungsten-Doped Strontium Titanate Ceramics", Thesis, Univ. of Ill. at Urbana-Champagne, 1981 (No Month).
Mehrotra, Arun Kumar, "Microstructure and Dielectric Behavior for Pure and Bismuth Doped Strontium --Titanate Polycrystalline, " Univ. of Ill. at Urbana-Champagne, 1982 No Month.

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