X7R dielectric ceramic composition and capacitor made therefrom

Details X7R dielectric ceramic composition and capacitor made therefrom X7R dielectric ceramic composition and capacitor made therefrom

1990-12-07

1992-07-07

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

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

501138, 501139, 361321, C04B 3546

Patent

active

051282895

ABSTRACT:
A barium titanate based dielectric ceramic composition having a temperature coefficient range of about +/-15% form its value at 25.degree. C. over a temperature range of -55.degree. C. to 125.degree. C., and a dielectric constant in excess of 5000, is prepared from a ternary system comprising barium titanate, nickel niobate and manganese niobate in the molar ratios of approximately 97.23 mole % of BaTiO.sub.3, 2.35 mole % of NiO.sub.(1-x).NbO.sub.2.5(x), and 0.42 mole % of MnO.sub.1-y).NbO.sub.2.5(y), where x may equal approximately 0.73 and y approximately 0.53. Tantalum is also used in place of the niobium.

REFERENCES:
patent: 4379319 (1983-04-01), Wilson
patent: 4670243 (1987-06-01), Wilson
patent: 4816430 (1989-03-01), Chu
patent: 4863883 (1989-09-01), Menashi et al.
patent: 4882305 (1989-11-01), Chu et al.
patent: 4939108 (1990-07-01), Dean
patent: 4988650 (1991-01-01), Takagi et al.
patent: 5084424 (1992-01-01), Abe et al.
BaTiO.sub.3 Based Solid Solution of Niobates and Tantalates of Transition Metals Soviet Phys. Solid State 2, 66 (1960), translated from Fizika Tverdogo Tela vol. 2, No. 1, pp. 73-79, Jan. 1960.
Hennings and Rosentein (Temperature-Stable Dielectric Based on Chemically Inhomogeneous BaTiO.sub.3, Apr. 1984, vol. 67, No. 4 of Journal of the American Ceramic Society.
Barium Titanate Based Ceramic Materials for Dielectric Use, Int. J. High Technology Ceramics 3, pp. 91-110, 1987 Elservier Applied Science Publishers Ltd., England.

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