The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 2001
Filed:
Jun. 23, 2000
Sumitomo Special Metals Co., Ltd., Osaka, JP;
Abstract
A dielectric ceramic composition for electronic devices, which exhibits &tgr;f and ∈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,.Ta,)O,—Y(Ba,.Sr,)(Ga,.Ta,)O,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and has a Zn content adjusted to a predetermined level, wherein part of Ta contained in the XBa(Zn,.Ta,)O,moiety has been replaced by Nb.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,.Sr,)(Ga,.Ta,)O,moiety, thus attaining the effects of improvement in permittivity and control of temperature characteristics simultaneously.