US 11,869,724 B2
Multilayer ceramic capacitor
Yuta Kurosu, Nagaokakyo (JP); Yuta Saito, Nagaokakyo (JP); Masahiro Wakashima, Nagaokakyo (JP); Daiki Fukunaga, Nagaokakyo (JP); and Yu Tsutsui, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Jan. 30, 2023, as Appl. No. 18/103,054.
Application 18/103,054 is a continuation of application No. 17/131,888, filed on Dec. 23, 2020, granted, now 11,600,446.
Claims priority of application No. 2019-238184 (JP), filed on Dec. 27, 2019; and application No. 2020-186017 (JP), filed on Nov. 6, 2020.
Prior Publication US 2023/0178305 A1, Jun. 8, 2023
Int. Cl. H01G 4/30 (2006.01); H01G 4/232 (2006.01); H01G 4/248 (2006.01); H01G 4/12 (2006.01); H01G 4/008 (2006.01)
CPC H01G 4/30 (2013.01) [H01G 4/008 (2013.01); H01G 4/1218 (2013.01); H01G 4/2325 (2013.01); H01G 4/248 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
a multilayer body including a dielectric ceramic layer and an internal electrode layer stacked in a stacking direction; and
an external electrode connected to the internal electrode layer; wherein
the multilayer body includes a first main surface and a second main surface on opposite sides in the stacking direction, a first side surface and a second side surface on opposite sides in a width direction orthogonal or substantially orthogonal to the stacking direction, and a first end surface and a second end surface on opposite sides in a length direction orthogonal or substantially orthogonal to the stacking direction and the width direction;
the internal electrode layer includes a first internal electrode layer that extends to the first end surface, and a second internal electrode layer that extends to the second end surface;
the second internal electrode layer is opposed to the first internal electrode layer with the dielectric ceramic layer interposed therebetween;
the external electrode includes a first external electrode that is disposed on the first end surface and is connected to the first internal electrode layer, and a second external electrode that is disposed on the second end surface and is connected to the second internal electrode layer;
the dielectric ceramic layer includes first dielectric ceramic layers and a second dielectric ceramic layer;
the first dielectric ceramic layers include Ba and Ti, and at least one of the first dielectric ceramic layers is disposed between the first internal electrode layer and the second internal electrode layer;
the second dielectric ceramic layer includes a region between two of the first dielectric ceramic layers opposite to each other with the internal electrode layer interposed therebetween, and in which the internal electrode layer is not disposed, and such that a portion of the second dielectric ceramic layer overlaps the two first dielectric ceramic layers in the stacking direction;
the multilayer body includes an inner layer portion in which the first internal electrode layer and the second internal electrode layer are alternately stacked with the dielectric ceramic layer interposed therebetween, an outer layer portion sandwiching the inner layer portion in the stacking direction and including a ceramic material, and a third dielectric ceramic layer sandwiching the inner layer portion and the outer layer portion in the width direction and including a dielectric ceramic material;
a second alloy portion including one metal element provided in a greatest amount among metal elements of the internal electrode layer, and one or more metal elements among a metal group including Sn, In, Ga, Zn, Bi, Pb, Cu, Ag, Pd, Pt, Ph, Ir, Ru, Os, Fe, V, and Y is provided between the second dielectric ceramic layer and the first internal electrode layer, and between the second dielectric ceramic layer and the second internal electrode layer, respectively;
a first alloy portion including the one metal element, and one or more metal elements among the metal group is provided between the first dielectric ceramic layers and the first internal electrode layer and between the first dielectric ceramic layers and the second internal electrode layer, respectively;
the second alloy portion has a higher molar ratio than the first alloy portion, relative to 100 moles of Ti in content of the metal group; and
a porosity of the first dielectric ceramic layer, a porosity of the second dielectric ceramic layer, and a porosity of the third dielectric ceramic layer are different from each other.