Microwave dielectric ceramic composition
US5403796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1994 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Jan 27, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/465
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In order to obtain a microwave dielectric ceramic composition having a high dielectric constant (.epsilon.r) and a large Q value and having a temperature coefficient of resonance frequency (.tau.f) which is close to zero, the present invention is directed to a microwave dielectric ceramic composition expressed by a composition formula of w.Li.sub.2 O-x.CaO-y.Sm.sub.2 O.sub.3 -z.TiO.sub.2, wherein w, x, y and z are respectively in the ranges of 0.0 mole % <w.ltoreq.25.0 mole %, 0.0 mole % .ltoreq.x.ltoreq.50.0 mole %, 0.0 mole % <y.ltoreq.30.0 mole %, 0.0 mole % <z.ltoreq.80.0 mole %, where w+x+y+z=100 mole %, and not more than 10 parts by weight of any one of MnO.sub.2, Bi.sub.2 0.sub.3, Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5 and SnO.sub.2 is contained therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.