| 摘要 |
A multilayer ceramic capacitor of the present invention includes dielectric layers and each of the dielectric layers has a main component containing barium titanate, a first auxiliary component composed of at least one kind selected from the group consisting of MgO, CaO, 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<SUB>2</SUB>O<SUB>5</SUB>, MoO<SUB>3</SUB>, and WO<SUB>3</SUB>, 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<SUB>3 </SUB>or a mixture (CaO+ZrO<SUB>2</SUB>) of CaO and ZrO<SUB>2</SUB>. Zr diffuses in crystal grains forming the dielectric layers and, in the crystal grains each having an average grain diameter, the depth of a diffusion layer of Zr is 10 to 35% relative to the diameter of the crystal grain. Therefore, the multilayer ceramic capacitor is excellent in reliability wherein the capacitance-temperature characteristic, i.e. a time-dependent change in capacitance, satisfies the EIA standard X8R characteristic (DeltaC/C=±15% at -55 to +150° C.) and the resistance change ratio in an acceleration test is small (average life is long).
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