Dielectric ceramic composition
US5093757A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1991 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Feb 5, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/499
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a dielectric ceramic composition that can be baked in a short time in the atmosphere, neutral atmosphere or reducing atmosphere at baking temperature of 800.degree. to 1000.degree. C. In the ceramic components expressed by PbTi.sub.X (Mg.sub.1/2 Nb.sub.2/3).sub.Y (Ni.sub.1/2 W.sub.1/2)ZO.sub.3 (where X+Y+Z=1), PbO is added by 1.0 to 25.0 mol % and NiO by 1.0 to 15.0 mol % as subsidiary components, to the temporarily baked powder of the main component dielectric ceramic composition composed in the pentagonal region having the vertices at compositions A, B, C, D, E expressed by numerical values in the following square brackets, in the system of trigonometric coordinates having the vertices at PbTiO.sub.3, Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 and Pb(Ni.sub.1/2 W.sub.1/2)O.sub.3, PA1 A is x=2.5, y=9.5, z=2.5; PA1 B is x=12.5, y=85.0, z=2.5, PA1 C is x=60.0, y=10.0, z=30.0, PA1 D is x=40.0, y=10.0, z=50.0, PA1 E is x=2.5, y=90.0, z=7.5 (where all untis are mol %) so that a laminate ceramic capacitor or thick film capacitor of large capacity that can be baked densely in a short time at low baking temperature of below 1000.degree. C. will be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.