US 12,255,024 B2
Capacitor with barium titanate dielectric layers
Maiko Nagayoshi, Kirishima (JP)
Assigned to KYOCERA Corporation, Kyoto (JP)
Appl. No. 17/799,092
Filed by KYOCERA Corporation, Kyoto (JP)
PCT Filed Feb. 1, 2021, PCT No. PCT/JP2021/003582
§ 371(c)(1), (2) Date Aug. 11, 2022,
PCT Pub. No. WO2021/171920, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-031925 (JP), filed on Feb. 27, 2020.
Prior Publication US 2023/0082288 A1, Mar. 16, 2023
Int. Cl. H01G 4/30 (2006.01); C04B 35/468 (2006.01); H01G 4/012 (2006.01); H01G 4/12 (2006.01)
CPC H01G 4/30 (2013.01) [C04B 35/4682 (2013.01); H01G 4/012 (2013.01); H01G 4/1227 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/85 (2013.01); H01G 4/12 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A capacitor, comprising:
a stack including a plurality of dielectric layers and a plurality of internal electrode layers alternately stacked on one another; and
an external electrode on a surface of the stack, the external electrode being electrically connected to the plurality of internal electrodes,
the plurality of dielectric layers including crystal grains comprising barium titanate and an additive element,
the crystal grains including first crystal grains and second crystal grains having a grain size larger than the first crystal grains,
the first crystal grains satisfying 0.13 μm≤d1<0.30 μm, where d1 is a grain size of the first crystal grains, the second crystal grains satisfying 0.30 μm≤d2<0.50 μm, where d2 is the grain size of the second crystal grains,
the second crystal grains having a higher additive element content than the first crystal grains,
the second crystal grains having an area percentage of 4 to 18% inclusive per unit area in a cross section of the plurality of dielectric layers.