Multilayer ceramic capacitor
A multilayer ceramic capacitor includes dielectric layers and inner electrode layers stacked and each made of a ceramic material. Each of the inner electrode layers includes through holes. An average circularity of the through holes is equal to or greater than to about 0.6.
1 . A multilayer ceramic capacitor comprising:
a plurality of dielectric layers and a plurality of inner electrode layers being stacked and each made of a ceramic material; wherein
each of the plurality of inner electrode layers includes a plurality of through holes;
an average circularity of the plurality of through holes is equal to or greater than 0.6;
at least some of the plurality of through holes include Si; and
a concentration of Si at edges of the through holes is higher than a concentration of Si at centers of the through holes.
2 . The multilayer ceramic capacitor according to claim 1 , wherein, in the plurality of through holes, a percentage of through holes with circularity equal to or greater than 0.6 is equal to or greater than about 60%.
3 . The multilayer ceramic capacitor according to claim 2 , wherein, in the plurality of through holes, a percentage of through holes with circularity equal to or greater than 0.6 is equal to or greater than about 70%.
4 . The multilayer ceramic capacitor according to claim 1 , wherein
the plurality of dielectric layer and the plurality of inner electrode layer define a multilayer body;
the multilayer body includes an inner layer portion and first and second outer layer portions respectively provided on opposite sides of the inner layer portion; and
each of the first and second outer layer portions includes a portion of the plurality of dielectric layers.
5 . The multilayer ceramic capacitor according to claim 4 , wherein each of the first and second outer layer portions defines and functions as a protective layer of the inner layer portion.
6 . The multilayer ceramic capacitor according to claim 4 , wherein the multilayer body has a dimension a length direction equal to or greater than about 0.1 mm and less than or equal to about 32 mm, a dimension in a width direction equal to or greater than about 0.05 mm and less than or equal to about 25 mm, and a dimension in a stacking direction equal to or greater than about 0.05 mm and less than or equal to about 32 mm.
7 . The multilayer ceramic capacitor according to claim 4 , wherein the multilayer body has a dimension a length direction equal to or greater than about 0.1 mm and less than or equal to about 1.2 mm, a dimension in a width direction equal to or greater than about 0.1 mm and less than or equal to about 0.7 mm, and a dimension in a stacking direction equal to or greater than about 0.1 mm and less than or equal to about 0.7 mm.
8 . The multilayer ceramic capacitor according to claim 4 , wherein the multilayer body has a dimension a length direction equal to or greater than about 0.2 mm and less than or equal to about 0.5 mm, a dimension in a width direction equal to or greater than about 0.1 mm and less than or equal to about 0.3 mm, and a dimension in a stacking direction equal to or greater than about 0.1 mm and less than or equal to about 0.3 mm.
9 . The multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of dielectric layers includes BaTiO 3 , CaTiO 3 , SrTiO 3 , or CaZrO 3 as a primary component.
10 . The multilayer ceramic capacitor according to claim 9 , wherein each of the plurality of dielectric layers includes a Mn chemical compound, a Fe chemical compound, a Cr chemical compound, a Co chemical compound, a Ni chemical compound as a secondary component.
11 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of dielectric layers is about 0.2 μm and less than or equal to about 1.0 μm.
12 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of dielectric layers is about 0.3 μm and less than or equal to about 0.5 μm.
13 . The multilayer ceramic capacitor according to claim 1 , wherein a number of the plurality of dielectric layers is equal to or greater than 15 and less than or equal to 700.
14 . The multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of inner electrode layers includes Ni as a primary component.
15 . The multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of inner electrode layers includes at least one of Cu, Ag, Pd, or Au, or alloys including a Ag—Pd alloy.
16 . The multilayer ceramic capacitor according to claim 1 , wherein Sn is mixed as a solid in a portion of each of the plurality of inner electrode layers.
17 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of inner electrode layers is equal to or greater than about 0.2 μm and less than or equal to about 2.0 μm.
18 . The multilayer ceramic capacitor according to claim 1 , wherein a number of the plurality of inner electrode layers is equal to or greater than 15 and less than or equal to 700.
19 . The multilayer ceramic capacitor according to claim 1 , wherein among the through holes exhibiting Si segregation, a percentage of the through holes in which Mg segregates is less than or equal to 20%.