Solid dielectric capacitor and method of manufacture
US4999736A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1990 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Feb 21, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/435
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula, EQU (1-.alpha.)(Ba.sub.k-x-y L.sub.x M.sub.y)O.sub.k TiO.sub.2)+.alpha.CaZrO.sub.s, where L is either or both of magnesium and zinc, M is either or both of calcium and strontium, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a mixture of lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere at temperatures of less than 1200.degree. C. and then are reheated at a lower temperature in an oxidative atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.