Ceramic dielectric composition
US3997457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1976 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Mar 2, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G4/1209
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ceramic dielectric compositon is provided which consists essentially of a sintered metal oxide mixture expressed by the formula: EQU [(Ba.sub.1.sub.-u Me.sub.u)O].sub.x.[(Ta.sub.1.sub.-v Nb.sub.v).sub.2 O.sub.5 ].sub.y.[Bi.sub.2 O.sub.3 ].sub.z where Me is at least one divalent metal selected from lead and strontium, and x, y, z, u and v are numbers falling within the following ranges EQU 0.05 .ltoreq. x .ltoreq. 0.80, EQU 0.05 .ltoreq. y .ltoreq. 0.30, EQU 0.10 .ltoreq. z .ltoreq. 0.80, EQU 0 .ltoreq. u .ltoreq. 1.00, EQU 0 .ltoreq. v .ltoreq. 1.00 and EQU x + y + z = 1.0. This composition may contain specified metal oxide additives. The ceramic dielectric composition is sintered at a relatively low temperature and exhibits a dielectric constant varying linearly depending upon temperature variations over a wide use range, a reduced dielectric loss, enhanced resistivity and breakdown voltage, and therefore, is particularly suitable for "temperature-compensating" capacitors of a compact type with large capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.