Dielectric ceramic composition and monolithic ceramic capacitor using same
AssigneeMurata Manufacturing Co., Ltd.
InventorsShinobu Mizuno, Norihiko Sakamoto, Nobuyuki Wada
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Abstract
The present invention provides a dielectric ceramic composition containing 100 parts by weight of essential component represented by (BaO).sub.m TiO.sub.2 +M.sub.2 O.sub.3 +R.sub.2 O.sub.3 +BaZrO.sub.3 +MgO+MnO (wherein M.sub.2 O.sub.3 represents Sc.sub.2 O.sub.3 and/or at least one 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 0.2 to 3.0 parts by weight of a side component represented by Li.sub.2 O--(Si, Ti)O.sub.2 --MO (wherein MO represents Al.sub.2 O.sub.3 and or ZrO.sub.2) or SiO.sub.2 --TiO.sub.2 --XO (wherein XO represents at least one of BaO, CaO, SrO, MgO, ZnO and MnO), and a ceramic capacitor using the same.
Claims20
A dielectric ceramic composition comprising barium titanate containing about 0.02% by weight or less of alkali metal oxides;
- at least one of scandium oxide or yttrium oxide;
- at least one of europium oxide, gadolinilinm oxide, terbium oxide, dysprosium oxide, holmium oxide, erbium oxide, thuliumi oxide and ytterbium oxide;
- barium zirconate and manganese oxide, as an essential component represented by the composition formula
- (BaO).sub.m TiO.sub.2 +.alpha.M.sub.2 O.sub.3 +.beta.R.sub.2 O.sub.3 +.beta.'R'.sub.2 O.sub.3 +.gamma.BaZrO.sub.3 +gMnO
- wherein M is at least one of Sc and Y;
- R is at least one of Eu, Gd, Tb and Dy;
- R' is at least one of R, Ho, Er, Tm and Yb;
- .alpha..ltoreq.0.06;
- .beta..ltoreq.0.06;
- .beta.'.ltoreq.0.06;
- 0.005.ltoreq..gamma.0.06;
- 0.001<g.ltoreq.0.13;
- .alpha.+.beta.+.beta.'<0.06;
- and 1.000<m<1.035;
- provided at least one of .beta. and .beta. is 0 and at least one of .alpha., .beta. and .beta. is not 0;
- and about 0.2 to 3.0 parts by weight of a side component relative to 100 parts by weight of said essential component, wherein said side component is an oxide represented by Li.sub.2 O--(Si, Ti)O.sub.2 --MO or SiO.sub.2 --TiO.sub.2 --XO, wherein MO is at least one of Al.sub.2 O.sub.3 or ZrO.sub.2 and wherein XO is at least one of BaO, CaO, SrO, MgO, ZnO and MnO.
Dependencies are inferred from the claim text.