Non-reducing dielectric ceramic materials
US6118648A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1998 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Mar 26, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/79
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A non-reductive dielectric ceramic material having a main component represented by [(Ca.sub.X Sr.sub.1-X)O].sub.m [(Ti.sub.Y Zr.sub.1-Y)O.sub.2 ] wherein X, Y and m fulfills 0.ltoreq.X.ltoreq.1, 0.ltoreq.Y.ltoreq.0.10 and 0.75.ltoreq.m.ltoreq.1.04, and auxiliary component containing 0.2-5 mol % (calculated MnO) of Mn oxide, 0.1-10 mol % (calculated as Al.sub.2 O.sub.3) of Al oxide and 0.5-15 mol % of a component of formula [(Ba.sub.Z Ca.sub.1-Z)O].sub.V SiO.sub.2 wherein 0.ltoreq.Z.ltoreq.1 and 0.5.ltoreq.V.ltoreq.4.0; and when used in a laminated ceramic condenser using a base metal such as Ni as inner electrode, can be sintered at a temperature not exceeding 1,300.degree. C., shows a small temperature coefficient of capacitance, can be controlled arbitrarily in the range of -150 to +150 ppm/.degree. C., has a specific resistance of no less than 1.times.10.sup.13 .OMEGA.cm at 25.degree. C., displays a small frequency-dependence of dielectric constant and dielectric loss tangent (tan .delta.) and has a long accelerated lifetime of insulating resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.