Dielectric composition for multilayered ceramic capacitor, multilayered ceramic capacitor comprising same, and manufacturing method for capacitor
A dielectric composition for a multilayered ceramic capacitor is provided, the multilayered ceramic capacitor includes the same, and a manufacturing method for the capacitor is also provided. The dielectric composition for a multilayered ceramic capacitor includes a barium-based compound, gadolinium oxide (Gd 2 O 3 ), manganese oxide (Mn 3 O 4 ), and magnesium carbonate (MgCO 3 ). Accordingly, the dielectric composition is excellent in performance as well as reliability.
1 . A dielectric composition for a multilayered ceramic capacitor, comprising:
a barium-based compound, Gd 2 O 3 , Mn 3 O 4 and MgCO 3 ,
wherein the barium-based compound comprises BaZrO 3 and BaTiO 3 , wherein the barium-based compound comprises BaZrO 3 and BaTiO 3 at a molar ratio of 1:2 to 6, and wherein the dielectric composition comprises 2 to 6 mole parts of Gd 2 O 3 , 0.01 to 1 mole part of Mn 3 O 4 powder and 2 to 6 mole parts of MgCO 3 , based on 100 mole parts of the barium-based compound.
2 . The dielectric composition according to claim 1 , wherein the dielectric composition satisfies conditions (1) to (3) below:
D
10
≤
60
nm
(
1
)
150
nm
≤
D
50
≤
350
nm
(
2
)
D
90
≤
2
,
TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]
000
nm
(
3
)
wherein in the conditions (1) to (3) above, D10, D50 and D90 refer to particle sizes corresponding to 10%, 50% and 90% of a maximum value in a volumetric distribution of the dielectric composition particle size, respectively.
3 . A multilayered ceramic capacitor, comprising:
a capacitor body, wherein a ceramic body and internal electrodes are alternately stacked in the capacitor body, wherein the dielectric composition according to claim 1 is sintered in the ceramic body; and
external electrodes, wherein the external electrodes are formed on an outer surface of the capacitor body and electrically connected to the internal electrodes.
4 . A method for manufacturing a multilayered ceramic capacitor, comprising:
1) preparing a dielectric composition for a multilayered ceramic capacitor according to claim 1 ;
2) preparing a ceramic slurry by mixing the dielectric composition with a binder and an organic solvent;
3) forming a ceramic green sheet by casting the ceramic slurry;
4) manufacturing a green chip by printing internal electrodes on one surface of the ceramic green sheet and stacking a plurality of ceramic green sheets the same;
5) manufacturing a capacitor body by performing a debinding process and a sintering process on the green chip; and
6) manufacturing a multilayered ceramic capacitor by printing external electrodes electrically connected to the internal electrodes on an external surface of the capacitor body.
5 . The method according to claim 4 , wherein in step 2), the dielectric composition is mixed with a binder and an organic solvent, pulverized and subjected to a defoamation process and an aging process to prepare the ceramic slurry, wherein the ceramic slurry satisfies conditions (1) to (3) below and has a viscosity of 100 to 500 cps:
D
10
≤
60
nm
(
1
)
150
nm
≤
D
50
≤
350
nm
(
2
)
D
90
≤
2
,
TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]
000
nm
(
3
)
wherein in the conditions (1) to (3) above, D10, D50 and D90 refer to particle sizes corresponding to 10%, 50% and 90% of a maximum value in a volumetric distribution of the dielectric composition particle size, respectively.
6 . The method according to claim 4 , wherein the binder comprises at least one selected from polyvinyl butyral, ethyl cellulose, polyvinyl alcohol and acryl.