Dielectric ceramic compositions
US5512524A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Dec 29, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/4686
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to a ceramic composition comprising at least three of the four phases BaTi.sub.4 O.sub.9, Ba.sub.2 Ti.sub.9, BaZn.sub.2 Ti.sub.4 O.sub.11 and Ba.sub.3 Nb.sub.4 Ti.sub.4 O.sub.21 (i.e., the phases BT.sub.4 ss, BZ.sub.2 T.sub.9 ss BZ.sub.2 T.sub.4 and BNbT). The ceramic composition may further comprise the phase Ba.sub.3 Ta.sub.4 Ti.sub.4 O.sub.21 (BTaT). The ceramic compositions have an excellent combination of electrical characteristics including Q value at the frequencies of interest for dielectric resonators, the dielectric constant and the T.sub.f value and are well adapted for use as electrical components in equipment operating at microwave frequencies such cellular communications equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.