Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1990-02-21
1991-04-09
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
264 65, 501137, C04B 3546, H01G 412, H01G 410
Patent
active
050069551
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,
(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 }+.alpha.CaZrO.sub.3
where M is either or both of calcium and strontium, and .alpha., k 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 ingredients 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.
REFERENCES:
patent: 4610968 (1986-09-01), Wada et al.
patent: 4610969 (1986-09-01), Wada et al.
patent: 4610970 (1986-09-01), Wada et al.
patent: 4610971 (1986-09-01), Wada et al.
patent: 4809130 (1989-02-01), Chazono et al.
Chazono Hirokazu
Kishi Hiroshi
Nakamura Toshiya
Oshio Minoru
Saito Hiroshi
Griffin Donald A.
Taiyo Yuden Co. Ltd.
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