Patent ID: 7595974
Filing Date: 2009-09-29
Classification: H01G

Abstract:
1. A multilayer ceramic capacitor comprising: a layered dielectric body composed by alternately dielectric layers; and internal electrode layers, the layered dielectric body having 50 layers or more; and a pair of external electrodes connecting to the internal electrodes alternately at the both ends of the layered dielectric body, wherein the dielectric layers comprise a barium titanate as a main component, sintering aids, a first sub-component and a second sub-component, the sintering aids comprising silicon oxide as a main component and at least one of an M oxide (M is at least one element selected from a group consisting of Ba, Ca, Sr and Mg), lithium oxide and boron oxide, the first sub-component comprising at least one of oxides selected from magnesium oxide, calcium oxide, barium oxide, strontium oxide and chromium oxide, the second sub-component comprising one of R1 oxides (R1 is at least one element selected from a group of consisting of Sc, Er, Tm, Yb, Lu, Y, Dy, Ho, Tb, Gd and Eu), wherein the internal electrode layer is made of a nickel or nickel alloy, and an average particle size of a raw material powder for the internal electrode layer is smaller than an average particle size of a raw material powder for the dielectric layers, the average particle size of the raw material powder for the internal electrode layer being more than 0 and not more than 0.3 μm, the average particle size of the raw material powder for the dielectric layers being more than 0 and not more than 0.45 μm, wherein a thickness of each internal electrode layer is more than 0.2 μm and not more than 2.5 μm, and a thickness of each dielectric layer is more than 0.5 μm and not more than 5 μm, where in a tension stress in a direction of an electric field remains at a exposed face parallel to the direction of the electric field inside the layered dielectric body and the tension stress calculated by an X-ray diffraction measurement is a value not less than 50 MPa.