Monolithic ceramic capacitor

Details Monolithic ceramic capacitor Monolithic ceramic capacitor

1996-12-18

1998-03-24

Ledynh, Bot L.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

361311, 3613215, 361303, 361305, 3613081, 361309, 361313, H01G 406, H01G 4008, H01G 4005, H01G 4228

Patent

active

057319502

ABSTRACT:
Disclosed is a monolithic ceramic capacitor comprising dielectric ceramic layers made from a ceramic composition, which comprises an essential component of (1-.alpha.-.beta.) {BaO}.sub.m .multidot.TiO.sub.2 +.alpha.{(1-x)M.sub.2 O.sub.3 +xRe.sub.2 O.sub.3 }+.beta.(Mn.sub.1-y-z Ni.sub.y Co.sub.z)O (0.0025.ltoreq..alpha..ltoreq.0.025; 0.0025.ltoreq..beta..ltoreq.0.05; .beta./.alpha..ltoreq.4; 0<x.ltoreq.0.50; 0.ltoreq.y<1.0; 0.ltoreq.z<1.0; 0.ltoreq.y+z<1.0; 1.000<m.ltoreq.1.035) and from 0.5 to mols, relative to 100 mols of the essential component, of a side component MgO, and contains from 0.2 to 3.0 parts by weight, relative to 100 parts by weight of said components, of an oxide of the type of Li.sub.2 O--(Si,Ti)O.sub.2 --Al.sub.2 O.sub.3 --ZrO.sub.2. The capacitor can be small-sized while having large capacity. It can be produced even through baking in atmospheres having a low oxygen partial pressure without producing semiconductors. It has a dielectric constant of 3000 or more, and has an insulating resistance of 6000 .OMEGA..multidot.F or more, which is lowered little even in strong electric fields. It has good reliability and has a high rated voltage even when its dielectric layers are thinned, and has temperature-dependent capacitance that satisfies the B-level characteristic standard stipulated in the JIS Standard and the X7R-level characteristic standard stipulated in the EIA Standard. It has excellent weather resistance even under a load of high temperature and/or a load of high humidity.

REFERENCES:
patent: 4987107 (1991-01-01), Narumi et al.
patent: 5225960 (1993-07-01), Kishi et al.
patent: 5337209 (1994-08-01), Sutherland et al.

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