Multilayer ceramic capacitor
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakehisa Sasabayashi, Yasuyuki Shimada, Naoto Muranishi, Shinichi Kokawa
Life of this patent
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Abstract
In a multilayer ceramic capacitor, when a ratio of an ICP peak intensity of Mn to an ICP peak intensity of Ti is an Mn/Ti peak intensity ratio, a value of the Mn/Ti peak intensity ratio in a dielectric ceramic layer in at least one of a main surface outer layer portion, a side surface outer layer portion, and an end surface outer layer portion is in a range of two times to fifteen times a value of the Mn/Ti peak intensity ratio in a dielectric ceramic layer in a central portion of an effective portion in a width direction, a length direction, and a stacking direction.
Claims15
A multilayer ceramic capacitor comprising:
- a multilayer body including a plurality of dielectric ceramic layers and a plurality of internal electrode layers that are alternately arranged in a stack, the plurality of dielectric ceramic layers each containing Ba, Ti, Mn, and a rare earth element, the multilayer body having:
- (a) a first main surface and a second main surface that face each other in a stacking direction in which the plurality of dielectric ceramic layers and the plurality of internal electrode layers are stacked;
- (b) a first side surface and a second side surface that face each other in a width direction orthogonal to the stacking direction;
- and (c) a first end surface and a second end surface that face each other in a length direction orthogonal to both the stacking direction and the width direction;
- a first external electrode on the first end surface and electrically connected to a first set of internal electrode layers of the plurality of internal electrode layers;
- and
- a second external electrode on the second end surface and electrically connected to a second set of internal electrode layers of the plurality of internal electrode layers, wherein
- a region where the first and second set of internal electrode layers overlap with each other in a view in the stacking direction is defined as an effective portion,
- each of regions sandwiching the effective portion in the stacking direction is defined as a main surface outer layer portion,
- each of regions sandwiching the effective portion in the width direction is defined as a side surface outer layer portion,
- each of regions sandwiching the effective portion in the length direction is defined as an end surface outer layer portion, and
- a ratio of a peak intensity of Mn by laser ICP to a peak intensity of Ti by laser ICP is an Mn/Ti peak intensity ratio,
- a value of the Mn/Ti peak intensity ratio in a dielectric ceramic layer in at least one of the main surface outer layer portion, the side surface outer layer portion, and the end surface outer layer portion is in a range of two times to fifteen times a value of the Mn/Ti peak intensity ratio in a dielectric ceramic layer in a central portion of the effective portion in the width direction, the length direction, and the stacking direction.
Dependencies are inferred from the claim text.