Monolithic ceramic capacitor

Details Monolithic ceramic capacitor Monolithic ceramic capacitor

H - Electricity

01

G

H01G 4/12 (2006.01) C04B 35/468 (2006.01) H01G 4/002 (2006.01)

Patent

CA 2210927

A monolithic ceramic capacitor having a plurality of dielectric ceramic layers, internal electrodes, and external electrodes electrically connected to the internal electrode, wherein the dielectric ceramic layers comprise (a) barium titanate having an alkali metal oxide impurity content of not more than about 0.02% by weight, (b) scandium oxide and/or yttrium oxide, (c) gadolinium oxide, terbium oxide and/or dysprosium oxide, (d) manganese oxide, (e) cobalt oxide, and (f) nickel oxide, and is a material containing (1) 100 mols represented by the compositional formula: (1-.alpha.-.beta.){BaO}m'TiO2+.alpha.{(1-x)M2O3+xRe2O3}+.beta.(Mn1-y-zNiyCOz)O wherein M2O3 represents said (b); Re2O3 represents said (c); 0.0025~.beta.~0.05; .beta./.alpha.<4; 0<x~0.50; 0~y1.0; 0~z1.0; 0~y+z<1.0; and 1.000<m~1.035, (2) about 0.5 to 5.0 mol, in terms of MgO, of magnesium oxide and (3) about 0.2 to 3.0 parts by weight, per 100 pph of components (1) and (2), of SiO2-TiO2-MO-based oxide glass (wherein MO represents at least one member selected from the group consisting of BaO, CaO, SrO, MgO, ZnO, and MnO). Said internal electrodes can be nickel or a nickel alloy.

Condensateur en céramique monolithique comportant plusieurs couches isolantes en céramique, des électrodes internes, et des électrodes externes, connectées aux électrodes internes; les couches isolantes en céramique renferment (a) du titanate de baryum avec une teneur en impuretés d'oxyde de métal alcalin ne dépassant pas 0,02 % en poids environ, (b) de l'oxyde de scandium et (ou) d'yttrium, (c) de l'oxyde de gadolinium, de terbium et (ou) de dysprosium, (d) de l'oxyde de manganèse, (e) de l'oxyde de cobalt, (f) de l'oxyde de nickel; il s'agit d'un matériau renfermant (1) 100 moles représentées par la formule (1-.alpha.-.bêta.){BaO}m'TiO2+.al-pha.{(1-x)M2O3+xRe2O3}+.bêta.(Mn1-y-zNiyCOz)O, où M2O3 représente (b); Re2O3 représente (c); 0,0025~.bêta.~0,05; .bêta./.alpha.<4; 0<x~0,50; 0~y1,0; 0~z1,0; 0~y+z<1,0; et 1,000<m~1,035, (2) environ 0,5 à 5,0 moles en MgO, oxyde de magnésium, et (3) environ 0,2 à 3,0 parties en poids par 100 parties de constituants (1) et (2), de verre de SiO2-TiO2-MO (MO représentant au moins l'un des oxydes BaO, CaO, SrO, MgO, ZnO ou MnO). Les électrodes internes peuvent être en nickel ou en alliage de nickel.

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