Ceramic composition for high-frequency dielectrics

Details Ceramic composition for high-frequency dielectrics Ceramic composition for high-frequency dielectrics

1997-08-13

1998-12-01

Brunsman, David

Compositions: ceramic

Ceramic compositions

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

L04B 3549

Patent

active

058438602

ABSTRACT:
The present invention provides to a ceramic composition for high-frequency dielectrics which comprises the main ingredients of ZrO.sub.2, SnO.sub.2 and TiO.sub.2 and a subsidiary ingredient of (Mn(NO.sub.3).sub.2.4H.sub.2 O). In accordance with the present invention, a homogeneous ceramic composition can be prepared by a process which comprises the steps of: adding ZrO.sub.2, SnO.sub.2 and TiO.sub.2 by the molar ratio to satisfy (ZrO.sub.2).sub.1-x (SnO.sub.2).sub.x (TiO.sub.2).sub.1+y (wherein, 0.1M<x<0.4M and 0M<y<0.1M); melting and grinding the mixture at 1900.degree. C. or above; and, adding 1% or less of Mn(NO.sub.3).sub.2.4H.sub.2 O by weight of MnO to the mixture. The ceramic composition of the invention has a high dielectric constant of 40 or more, a quality factor of 7000 or more, and a temperature coefficient of resonance frequency below 10. Accordingly, it can be used for an integrated circuit at microwave as well as at high frequency, or for dielectric resonators.

REFERENCES:
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patent: 5432134 (1995-07-01), Park et al.
patent: 5561090 (1996-10-01), Park et al.
Park, Y., Influence of Order-Disorder Transition on Microwave Characteristics of Tin Modified Zirconium Titanate, J. Mater. Scie. Lett., 14:873-875 (1995).
Park, Y. and Kim, Y.H., Order-Disorder Transition of Tin Modified Zirconium Titanate, Mater.Res.Bull., 31:7-15 (1996).
Hirano, S. et al., Chemical Processing and Microwave Characteristics of

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