Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1991-07-09
1992-07-14
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501139, C04B 3546
Patent
active
051302810
ABSTRACT:
The dielectric ceramic composite according to the invention contains at least one kind of lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide and samarium oxide at an amount of 2.5-5.0 mol % and zirconium oxide, tin oxide and titanium oxide at an amount of 0.5-8.5 mol% in a formula (Zr.sub.1-a-b Sn.sub.a Ti.sub.b) O.sub.3 (where a>0, b.gtoreq.0, 0<a+b.ltoreq.1.0) to barium titanate of 100 mol % containing alkali metal oxide less than 0.03% by weight as an impurity. Barium zirconate and barium stannate at an amount of 0.5-5.0 mol % in a formula Ba (Zr.sub.1-a Sn.sub.a) O.sub.3 (where 0<a.ltoreq.1.0) and titanium oxide at an amount of 1.5-6.0 mol % may be added instead of zirconium oxide, tin oxide, titanium oxide. The manufacturing method of dielectric ceramic according to the invention is a method which comprises a process of firing, in an atmosphere of 60% or more oxygen concentration, moldings of a composition containing at least one kind of a lanthanum compound, cerium compound, neodymium compound, praseodymium compound, and a samarium compound and further containing a zirconium compound, tin compound, and a titanium compound to a barium titanate base material.
REFERENCES:
patent: 4535064 (1985-08-01), Yoneda
patent: 4764494 (1988-08-01), Sakabe et al.
patent: 4767732 (1988-08-01), Furukawa et al.
Kohno Yoshiaki
Sakabe Yukio
Sano Harunobu
Wada Nobuyuki
Dixon Jr. William R.
Green Anthony J.
Murata Manufacturing Co. Ltd.
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