US 12,462,979 B2
Multilayer ceramic capacitor
Yuta Oshima, Nagaokakyo (JP); Shinya Isota, Nagaokakyo (JP); and Sho Watanabe, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Feb. 12, 2024, as Appl. No. 18/438,836.
Application 18/438,836 is a continuation of application No. PCT/JP2022/035979, filed on Sep. 27, 2022.
Claims priority of application No. 2021-161111 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0186068 A1, Jun. 6, 2024
Int. Cl. H01G 4/12 (2006.01); H01G 4/012 (2006.01); H01G 4/232 (2006.01); H01G 4/30 (2006.01)
CPC H01G 4/1227 (2013.01) [H01G 4/012 (2013.01); H01G 4/30 (2013.01); H01G 4/2325 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
an element body portion including a first main surface and a second main surface opposite to each other in a thickness direction, a first side surface and a second side surface opposite to each other in a width direction, and a first end surface and a second end surface opposite to each other in a length direction, the element body portion including a plurality of dielectric layers and a plurality of inner electrode layers alternately laminated in the thickness direction; and
a pair of outer electrodes on the first end surface and the second end surface and connected to the plurality of inner electrode layers; wherein
the element body portion includes:
a first side margin portion extending along the first side surface, made of a dielectric, and that does not include the inner electrode layers;
a second side margin portion extending along the second side surface, made of the dielectric, and that does not include the inner electrode layers;
a first outer layer portion made of the dielectric, sandwiched between the first side margin portion and the second side margin portion, and sandwiched between the first main surface and an inner electrode layer closest to the first main surface among the plurality of inner electrode layers;
a second outer layer portion made of the dielectric, sandwiched between the first side margin portion and the second side margin portion, and sandwiched between the second main surface and an inner electrode layer closest to the second main surface among the plurality of inner electrode layers; and
an inner layer portion sandwiched between the first side margin portion and the second side margin portion, sandwiched between the first outer layer portion and the second outer layer portion, and defined by a multilayer body including the plurality of dielectric layers and the plurality of inner electrode layers;
the dielectric of the first side margin portion, the second side margin portion, the first outer layer portion, and the second outer layer portion, and the plurality of dielectric layers included in the inner layer portion each include dielectric particles including barium and titanium as a main component, and, as sub-components, rare earth elements, and one or more first additional elements selected from manganese, vanadium, iron, copper, cobalt, nickel, or chromium; and
in a cross section crossing a center in the length direction of the multilayer ceramic capacitor, the dielectric layers included in the inner layer portion include, as the dielectric particles, both core-shell particles and uniform solid solution particles, a ratio (A/B) of an average area (A) occupied by the core-shell particles to an average area (B) occupied by the uniform solid solution particles is equal to or more than about 0.8 and equal to or less than about 1.5, and a coefficient of variation representing inter-particle variations of first additional element concentration included in the uniform solid solution particles is equal to or less than about 20%.