Multilayer ceramic capacitor and method for manufacturing multilayer ceramic capacitor
AssigneeMurata Manufacturing Co., Ltd.
InventorsKazunori USUI, Tatsunori YASUDA
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Abstract
A multilayer ceramic capacitor include a multilayer body including internal electrode layers including first and second internal electrode layers facing each other and separated from each other, and a dielectric layer between the first and second internal electrode layers and including a ceramic material, and an outer electrode selectively connected to the first and second internal electrode layers. Each of the first and second internal electrode layers includes a rare earth oxide distributed along at least one of a pair of interfaces with the dielectric layer.
Claims19
A multilayer ceramic capacitor comprising:
- a multilayer body including a plurality of stacked dielectric layers and a plurality of stacked internal electrode layers, and including a first main surface and a second main surface opposed to each other in a height direction, a first side surface and a second side surface opposed to each other in a width direction orthogonal or substantially orthogonal to the height direction, and a first end surface and a second end surface opposed to each other in a length direction orthogonal or substantially orthogonal to the height direction and the width direction;
- and
- a plurality of outer electrodes;
- wherein
- the plurality of internal electrode layers include:
- first internal electrode layers alternately stacked with the plurality of dielectric layers and exposed at the first end surface;
- and
- second internal electrode layers alternately stacked with the plurality of dielectric layers and exposed at the second end surface;
- the plurality of outer electrodes include:
- a first outer electrode connected to the first internal electrode layers;
- and
- a second outer electrode connected to the second internal electrode layers;
- the first internal electrode layers and the second internal electrode layers include a rare earth oxide;
- and
- the rare earth oxide in each of the first internal electrode layers and the second internal electrode layers is distributed along at least one of a pair of interfaces with the dielectric layer.
A multilayer ceramic capacitor comprising:
- a multilayer body including a plurality of stacked dielectric layers and a plurality of stacked internal electrode layers, and including a first main surface and a second main surface opposed to each other in a height direction, a first side surface and a second side surface opposed to each other in a width direction orthogonal or substantially orthogonal to the height direction, and a first end surface and a second end surface opposed to each other in a length direction orthogonal or substantially orthogonal to the height direction and the width direction;
- and
- a plurality of outer electrodes;
- wherein
- the plurality of internal electrode layers include:
- first internal electrode layers alternately stacked with the plurality of dielectric layers and exposed at the first end surface and the second end surface;
- and
- second internal electrode layers alternately stacked with the plurality of dielectric layers and exposed at the first side surface and second side surface;
- the plurality of outer electrodes include:
- a first outer electrode and a second outer electrode each connected to the first internal electrode layers;
- and
- a third outer electrode and a fourth outer electrode each connected to the second internal electrode layers;
- the first internal electrode layers and the second internal electrode layers include a rare earth oxide;
- and
- the rare earth oxide in each of the first internal electrode layers and the second internal electrode layers is distributed along at least one of a pair of interfaces with the dielectric layer.
A method for manufacturing a multilayer ceramic capacitor including a multilayer body including a plurality of internal electrode layers arranged to face each other and to be spaced apart from each other, and a dielectric layers between the plurality of internal electrode layers and including a ceramic material, and a plurality of outer electrodes on a surface of the multilayer body and selectively connected to the plurality of internal electrode layers, the method comprising:
- applying a conductive paste for forming the plurality of internal electrode layers on a dielectric sheet corresponding to the dielectric layer;
- and
- stacking, on the dielectric sheet to which the conductive paste is applied, another dielectric sheet to which the conductive paste is applied;
- wherein
- the applying includes:
- firstly applying a first conductive paste including a conductive material;
- and
- secondarily applying a second conductive paste including a conductive material and a rare earth oxide, the secondarily applying being performed before, after, or both before and after the firstly applying;
- and
- at least one of the stacking and the applying brings a surface to which the second conductive paste is applied, obtained by the secondarily applying, into contact with a surface of the dielectric sheet.
Dependencies are inferred from the claim text.