Ceramic composition
US5275988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1992 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Apr 9, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/499
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ceramic composition is herein disclosed, which is a lead-type perovskite compound capable of being subjected to low temperature-sintering among ceramic compositions for use in making capacitors, which has a high dielectric constant at room temperature of not less than 10000, a low temperature-dependency of the dielectric constant and a low decrease in capacitance upon application of a DC bias and which comprises, as a main constituent, a ternary system comprising lead magnesium niobate: [Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 ], lead nickel niobate: [Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 ] and lead titanate: [PbTiO.sub.3 ] in which part of the Pb.sup.2+ ions present in the ternary system are substituted with a desired amount of Sr.sup.2+ ions, Ba.sup.2+ ions or Ca.sup.2+ ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.