Dielectric porcelain composition for electronic devices
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United States of America Patent
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-
Dec 18, 2001
Grant Date -
N/A
app pub date -
Jun 23, 2000
filing date -
Dec 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A dielectric ceramic composition for electronic devices, which exhibits .tau.f and .di-elect cons.r characteristics equivalent or superior to those of the dielectric ceramic composition of the prior art, can inhibit the evaporation of Zn from the composition to thereby facilitate the control of makeup of the composition, can give homogeneous ceramics through short-time sintering more stably, is improved particularly in permittivity (Qf) and controllability of temperature characteristics, and permits downsizing of the dielectric elements. This composition is a solid solution of XBa(Zn.sub.1/3.Ta.sub.2/3)O.sub.3 --Y(Ba.sub.Z.Sr.sub.1-Z)(Ga.sub.1/2.Ta.sub.1/2)O.sub.3 which contains a specific trivalent metal ion and has a Zn content adjusted to a predetermined level, wherein part of Ta contained in the XBa(Zn.sub.1/3.Ta.sub.2/3)O.sub.3 moiety has been replaced by Nb. The composition is improved not only in permittivity by virtue of the above replacement but also in the degree of sintering by virtue of the above trivalent metal, i.e., Ga contained in the Y(Ba.sub.Z.Sr.sub.1-Z)(Ga.sub.1/2.Ta.sub.1/2)O.sub.3 moiety, thus attaining the effects of improvement in permittivity and control of temperature characteristics simultaneously.
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