Patent ID: 6245433
Filing Date: 2001-06-12
Classification: H01G

Abstract:
A dielectric ceramic composition which comprises a primary component and an auxiliary component;the primary component comprising barium titanate having an alkali metal oxide content of 0.02 wt % or less, barium zirconate, magnesium oxide and manganese oxide, and is represented by the formula:{BaO}.sub.m TiO.sub.2 +.alpha.M.sub.2 O.sub.3 +.beta.R.sub.2 O.sub.3 +.gamma.BaZrO.sub.3 +gMgO+hMnOwherein M.sub.2 O.sub.3 is at least one of Sc.sub.2 O.sub.3 or Y.sub.2 O.sub.3 ; R.sub.2 O.sub.3 is at least one member selected from the group consisting of Eu.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Tb.sub.2 O.sub.3. Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3, Er.sub.2 O.sub.3, Tm.sub.2 O.sub.3 and Yb.sub.2 O.sub.3, .alpha., .beta., .gamma., g or h each represent a mole ratio; and.alpha. is 0 or 0.001.ltoreq..alpha..ltoreq.0.06;.beta. is 0 or 0.001.ltoreq..beta..ltoreq.0.06;0.001.ltoreq..gamma..ltoreq.0.06;0.001<g.ltoreq.0.12;0.001<h.ltoreq.0.12;.alpha.+.beta..ltoreq.0.06g+h.ltoreq.0.13; and1.000<m.ltoreq.1.035,provided that when .alpha. has a positive value, R.sub.2 O.sub.3 is at least one member selected from the group consisting of Eu.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Tb.sub.2 O.sub.3 and Dy.sub.2 O.sub.3 and when .beta. has a positive value, 0.005.ltoreq..gamma.; andthe auxiliary component being silicon oxide in an amount of 0.2-5.0 mol calculated as SiO.sub.2 with respect to 100 mols of the primary component.