US 12,456,576 B2
Multilayer ceramic capacitor including monotectoid phase
Retsu Tahara, Nagaokakyo (JP); and Taeko Mishiro, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Jan. 11, 2024, as Appl. No. 18/410,054.
Claims priority of application No. 2023-004965 (JP), filed on Jan. 17, 2023.
Prior Publication US 2024/0242889 A1, Jul. 18, 2024
Int. Cl. H01G 2/24 (2006.01); H01G 4/12 (2006.01); H01G 4/224 (2006.01); H01G 4/232 (2006.01); H01G 4/30 (2006.01)
CPC H01G 2/24 (2013.01) [H01G 4/1236 (2013.01); H01G 4/224 (2013.01); H01G 4/232 (2013.01); H01G 4/30 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
a multilayer body including a plurality of dielectric layers that are stacked in a stacking direction and a plurality of internal electrode layers on the dielectric layers, the multilayer body being provided with a first main surface and a second main surface opposed to each other in a stacking direction, a first side surface and a second side surface opposed to each other in a width direction orthogonal to the stacking direction, and a first end surface and a second end surface opposed to each other in a length direction orthogonal to the stacking direction and the width direction;
a first external electrode on the first end surface; and
a second external electrode on the second end surface; wherein
the multilayer body includes:
an inner layer portion in which the dielectric layers and the internal electrode layers are alternately stacked;
a first main-surface-side outer layer portion and a second main-surface-side outer layer portion sandwiching the inner layer portion from a side of the first main surface and a side of the second main surface; and
a first side-surface-side outer layer portion and a second side-surface-side outer layer portion sandwiching the inner layer portion from a side of the first side surface and a side of the second side surface;
a difference between an RGB value that reproduces a color tone of ends in the width direction of the first main-surface-side outer layer portion and the second main-surface-side outer layer portion and an RGB value that reproduces a color tone of ends in the width direction of the first side-surface-side outer layer portion and the second side-surface-side outer layer portion is not smaller than about 45 and not larger than about 100;
the dielectric layers includes-a dielectric material;
a monotectoid phase is provided in the first side-surface-side outer layer portion and the second side-surface-side outer layer portion in a WT cross-section defined by the stacking direction and the width direction of the multilayer body:
the monotectoid phase includes at least one of Ca and Si; and
a region where the monotectoid phase is provided is not larger than about 3% of a total area of the first side-surface-side outer layer portion and the second side-surface-side outer layer portion in the WT cross-section of the multilayer body.