Dielectric ceramic composition and monolithic ceramic...

H - Electricity – 01 – B

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H01B 3/12 (2006.01) H01G 4/12 (2006.01)

Patent

CA 2207847

A dielectroc ceramic composition and a monolithic ceramic capacitor using the composition are provided. The dielectric ceramic composition includes: barium titanate; at least one rare earth oxide selected from terbium oxide, dysprosium oxide, holmium oxide, erbium oxide and ytterbium oxide; manganese oxide and nickel oxide; and magnesium oxide in an amount of from 0.5 to 3.0 mols in terms of MgO, and silicon oxide in an amount of from 0.2 to 5.0 mols in terms of SiO2, relative to 100 mols of the essential component having the following compositional formula: (1-.alpha.-.beta.) {BaO}m~TiO2 + .alpha.Re2O3 + .beta.(Mn1-x Ni x)O where Re2O3 is at least one selected from Tb2O3, Dy2O3 Ho2O3, Er2O3 and Yb2O3; and .alpha., .beta., m and x are as follows: 0.0025 ~ .alpha. ~ 0.020 0.0025 ~ .beta. ~ 0.04 .beta./.alpha. 5 ~ 4 0.5 ~ x < 1.0 1.000 < m ~ 1.035.

On présente une composition de céramique diélectrique et un condensateur de céramique monolithique utilisant cette composition. La composition de céramique diélectrique comprend : du titanate de baryum; au moins un oxyde de terres rares tel que l'oxyde de terbium, l'oxyde de dysprosium, l'oxyde d'holmium, l'oxyde d'erbium et l'oxyde d'ytterbium; de l'oxyde de manganèse et de l'oxyde de nickel; et de l'oxyde de magnésium dont la quantité varie entre 0,5 et 3,0 mols en termes de MgO, et de l'oxyde de silicone en quantité variant entre 0,2 et 5,0 mols en termes de SiO2, environ 100 mols de la composante essentielle dont la formule est la suivante : (1-alpha-beta) {BaO}m TiO2 + alpha.Re2O3 + beta.(Mn1-xNix)O où Re2O3 représente au moins une sélection de Tb2O3, Dy2O3, Ho2O3, Er2O3 et Yb2O3; et alpha., beta., m et x sont comme suit : 0,0025 ~ alpha. ~ 0,020 0,0025 ~ beta. ~ 0,04 beta./alpha. ~ 4 0 ~ X < 1,0 1,000< m ~ 1,035.

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