Dielectric ceramic composition and ceramic electronic component employing the same
AssigneeMatsushita Elec. Ind. Co. Ltd.
InventorsHidenori Katsumura, Ryuichi Saito, Hiroshi Kagata
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Abstract
A dielectric ceramics includes a main ingredient, and a supplemental ingredient in an amount of 0.05 to 2 wt % for the main ingredient. The main ingredient is expressed by xBiO3/2-yCaO-zNbO5/2 and is within a scope of a specified quadrilateral region in a ternary system diagram, and the supplemental ingredient is a glass composition including at least SiO2, Li2O and MO (M includes at least one of Ca, Sr and Ba). A ceramic electronic component is produced by co-firing a dielectric layer composed of the dielectric ceramics and a conductive layer mainly composed of silver, and has a low degradation in Q value and excellent microwave characteristics.
Claims4
A dielectric ceramic composition composed of;
- a main ingredient essentially consisting of bismuth oxide, calcium oxide and niobium oxide and is expressed by a formula xBiO3/2-yCaO-zNbO5/2 (x, y, z are in molar ratio, and x+y+z=1.0);
- and
- a supplemental ingredient that is a glass composition including at least 0.05 wt % and at most 2 wt % of uSiO2-vLi2O-wMO (u, v, w are in weight percentage, u+v+w=100, and M is composed of at least one of Ca, Sr and Ba),
- wherein x, y, and z are in a scope of region enclosed by a quadrilateral having following vertices A, B, C and D in a ternary system diagram of the main ingredient.
- A:
- (x, y, z)=(0.48, 0.184, 0.336)
- B:
- (x, y, z)=(0.48, 0.22, 0.30)
- C:
- (x, y, z)=(0.44, 0.24, 0.32)
- D:
- (x, y z)=(0.44, 0.20, 0.36)
A ceramic electronic component comprising:
- a dielectric layer made of a dielectric ceramic composition, the dielectric ceramic composition composed of;
- a main ingredient essentially consisting of bismuth oxide, calcium oxide and niobium oxide and is expressed by a formula xBiO3/2-yCaO-zNbO5/2 (x, y, z are in molar ratio, and x+y+z=1.0);
- and
- a supplemental ingredient that is a glass composition including at least 0.05 wt % and at most 2 wt % of uSiO2-vLi2O-wMO (u, v, w are in weight percentage, u+v+w=100, and M is composed of at least one of Ca, Sr and Ba),
- wherein, x, y, and z are in a scope of region enclosed by a quadrilateral having following vertices A, B, C and D in a ternary system diagram of the main ingredient,
- A:
- (x, y, z)=(0.48, 0.184, 0.336)
- B:
- (x, y, z)=(0.48, 0.22, 0.30)
- C:
- (x, y, z)=(0.44, 0.24, 0.32)
- D:
- (x, y z)=(0.44, 0.20, 0.36), and
- a conductive layer including at least 95 wt % of silver, the conductive layer being laminated with the dielectric layer.
Dependencies are inferred from the claim text.