Dielectric ceramic composition
US4900702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Oct 17, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/475
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A dielectric ceramic composition having a high relative dielectric constant a high quality factor and a small temperature coefficient of resonance frequency, consisting essentially of calcium oxide, strontium, oxide, bismuth oxide and titanium oxide, and having a composition represented by the formula: EQU (CaO).sub.a.(SrO).sub.b.(Bi.sub.2 O.sub.3).sub.c.(TiO.sub.2).sub.d wherein 0.ltoreq.a<30, 0<b.ltoreq.20, 10.ltoreq.c.ltoreq.50, 40.ltoreq.d.ltoreq.80, and 0<a+b.ltoreq.30 by mol %. This composition may contain at least one of thallium oxide, yttrium oxide and manganese oxide and at least one of germanium oxide, zirconium oxide, tin oxide, cerium oxide and hafnium oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.