US 12,406,807 B2
Multilayer ceramic capacitor
Natsuko Okubo, Nagaokakyo (JP); Akito Mori, Nagaokakyo (JP); and Kazuhisa Uchida, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Feb. 14, 2023, as Appl. No. 18/109,309.
Claims priority of application No. 2022-021772 (JP), filed on Feb. 16, 2022.
Prior Publication US 2023/0317374 A1, Oct. 5, 2023
Int. Cl. H01G 4/12 (2006.01); H01G 4/008 (2006.01); H01G 4/012 (2006.01); H01G 4/30 (2006.01)
CPC H01G 4/1227 (2013.01) [H01G 4/008 (2013.01); H01G 4/012 (2013.01); H01G 4/30 (2013.01); H01G 4/1236 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
a multilayer body including a plurality of dielectric layers made of a ceramic material and a plurality of internal electrode layers laminated therein, two main surfaces opposed to each other in a lamination direction, two lateral surfaces opposed to each other in a width direction intersecting the lamination direction, and two end surfaces opposed to each other in a length direction intersecting the lamination direction and the width direction; and
two external electrodes provided on each of the two end surfaces of the multilayer body; wherein
the multilayer body includes two side margin portions provided to sandwich the plurality of dielectric layers and the plurality of internal electrode layers in the width direction, the two side margin portions each including a dielectric made of a ceramic material;
each of the plurality of internal electrode layers includes, in the length direction, a counter electrode portion opposed to each other between adjacent internal electrode layers in the lamination direction, and an extension electrode portion extending from the counter electrode portion toward one of the two end surfaces;
end portions in the width direction of the counter electrode portions of the plurality of internal electrode layers are aligned to be positioned in a range of about 5 μm in the width direction;
a width in the width direction of the extension electrode portion is smaller than a width in the width direction of the counter electrode portion;
each of the two side margin portions includes Ba and Ti as main components, and Mg as a sub component;
Mg content in each of the two side margin portions is about 0.2 mol % or more and about 2.0 mol % or less with respect to 100 mol of Ti;
each of the plurality of internal electrode layers includes Ni as a main component;
an end portion in the width direction of the counter electrode portion of each of the plurality of internal electrode layers includes Mg as a sub component; and
Mg content at the end portion in the width direction of the counter electrode portion of each of the plurality of internal electrode layers is about 0.13 mol % or more and about 0.39 mol % or less with respect to 100 mol of Ni.