Dielectric ceramic composition and ceramic electronic part with

Details Dielectric ceramic composition and ceramic electronic part with Dielectric ceramic composition and ceramic electronic part with

1998-07-06

1999-11-30

Group, Karl

Compositions: ceramic

Ceramic compositions

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

501138, C04B 35468

Patent

active

059942533

ABSTRACT:
A dielectric ceramic composition is comprised of a crystal structure phase of a tungsten bronze form, one titanate-barium phase or more titanate-barium phases selected from Ba.sub.2 Ti.sub.9 O.sub.20, BaTi.sub.2 O.sub.5, BaTi.sub.4 O.sub.9 and Ba.sub.4 Ti.sub.13 O.sub.30, and a fine crystal phase comprising an oxide of each of at least B, Ag and Mn, in which the crystal structure phase of the tungsten bronze form is formed with a limited amount of a compound oxide of Ba, Nd and Ti as a basic component and contains a limited amount of each of an oxide of at least Bi, Pb, Zn and Si. The dielectric ceramic composition can be fired at a temperature of 920.degree. C. or lower and sintered forming into a ceramic electronic part which has remarkably high dielectric characteristics, such as the dielectric constant of 60 or higher, the Q factor of 1,000 or higher, and the temperature coefficient .tau..epsilon.r of the relative dielectric constant .epsilon.r of .+-.60 ppm/.degree. C. or smaller. The ceramic electronic parts for high frequency are further provided with high electrical features and prepared at low costs.

REFERENCES:
patent: 5310710 (1994-05-01), Takase et al.
patent: 5350721 (1994-09-01), Abe et al.
patent: 5556818 (1996-09-01), Kohler et al.
patent: 5650368 (1997-07-01), Tateishi et al.
patent: 5688732 (1997-11-01), Park et al.
patent: 5827792 (1998-10-01), Fukuda et al.

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