Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1986-07-14
1990-02-06
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501137, 501139, 252 629, C04B 3546
Patent
active
048988448
ABSTRACT:
A ceramic includes a dielectric ceramic body that is made by mixing powders of two barium titanate compositions of widely disparate Curie temperature with a minor quantity of a borate flux and a sintering-inhibitor such as titania or bismuth oxide. A body is formed of this start powders mixture. Upon sintering to maturity at about 1100.degree. C., the capacitor body becomes only partially co-reacted and has a dielectric constant around 2000 that varies no more than about 15% over a board operating temperature range. These properties are not a strong function of sintering conditions leading to good control at manufacturing.
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Kahn, "Preparation of Small--Grained and Large--Grained Ceramics from Nb--Doped BaTiO.sub.3 ", J. Amer. Ceram. Soc., vol. 54, No. 9, Sep. 1971.
Maher Galeb H.
Stefanik Susan E.
Bell Mark L.
Group Karl
Sprague Electric Company
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