Patent ID: 7061748

Claim:
A multilayer ceramic capacitor having a multilayer structure in which dielectric layers and internal electrode layers are alternately stacked, wherein each of said dielectric layers comprises: a main component containing barium titanate; a first auxiliary component composed of at least one kind selected from the group consisting of MgO, CaG, BaO, and SrO; a second auxiliary component containing a silicon oxide as a main component; a third auxiliary component composed of at least one kind selected from the group consisting of V 2 O 5 , MoO 3 , and WO 3 ; a fourth auxiliary component composed of an oxide of at least one kind of first rare-earth element (R 1 ) selected from the group consisting of Sc, Er, Tm, Yb, and Lu; and a fifth auxiliary component composed of CaZrO 3 or a mixture (CaO+ZrO 2 ) of CaO and ZrO 2 , wherein, with respect to 100 mol of the main component containing barium titanate, the content (mol) of the first auxiliary component is given as y 1 , the content (mol) of the second auxiliary component is given as y 2 , the content (mol) of the third auxiliary component is given as y 3 , the content (mol) of the fourth auxiliary component is given as y 4 , and the content (mol) of the fifth auxiliary component is given as y 5 , a value of y 1 falls within the range of 0.1 to 3.0 mol, a value of y 2 falls within the range of 2 to 10 mol, a value of y 3 falls within the range of 0.01 to 0.5 mol, a value of y 4 falls within the range of 0.5 to 7 mol (representing the content of R 1 alone), and a value of y 5 is 5 mol or less (not including zero), wherein Zr diffuses in crystal grains forming said dielectric layers and, in the crystal grains each having an average grain diameter, a depth of a diffusion layer of Zr is 10 to 35% relative to the diameter of the crystal grain, and wherein said depth of the diffusion of Zr is adjusted with a liquid phase addition of organic metal salts of Ca and Zr.