Dielectric porcelain composition for electronic devices
US6331498A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Dec 18, 2001 |
| Priority date | — |
| Expiry date | Jun 23, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/495
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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adjusted to a predetermined level, wherein part of Ta contained in the XBa(Zn.sub.1/3.Ta.sub.2/3)O.sub.3 moiety has been replaced by Nb.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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.