US 12,482,604 B2
Multilayer ceramic capacitor
Hideyuki Hashimoto, Nagaokakyo (JP); and Takehisa Sasabayashi, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Mar. 19, 2024, as Appl. No. 18/608,999.
Application 18/608,999 is a continuation of application No. PCT/JP2022/035444, filed on Sep. 22, 2022.
Claims priority of application No. 2021-158284 (JP), filed on Sep. 28, 2021.
Prior Publication US 2024/0222022 A1, Jul. 4, 2024
Int. Cl. H01G 4/12 (2006.01); H01G 4/224 (2006.01); H01G 4/30 (2006.01)
CPC H01G 4/1227 (2013.01) [H01G 4/224 (2013.01); H01G 4/306 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
a first primary surface and a second primary 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; and
a body including a plurality of dielectric ceramic layers and a plurality of inner electrode layers stacked in the thickness direction and a pair of outer electrodes provided at the first end surface and the second end surface and coupled to the plurality of inner electrode layers; wherein
the plurality of dielectric ceramic layers include crystal grains including a perovskite oxide including at least one A-site element and at least one B-site element;
when a cross-section of the dielectric ceramic layers is observed using a scanning transmission electron microscope, the dielectric ceramic layers include {100} grains, on which a {100} plane of a perovskite structure is observed, as crystal grains; and
when compositional analysis of the {100} grains is performed by energy dispersive x-ray spectroscopy on the cross-section, the {100} grains include an atom-distributed region in which a concentration of the A-site element or B-site element (c) subtracted from a maximum concentration of the element (cmax) (Δc=cmax−c) is about 2 atm % or less, at one or more atomic sites in the grains, and an area of the atom-distributed region (SΔc≤2%) is about 0.050 nm2 or less.