| 摘要 |
PURPOSE: To obtain a dielectric ceramic composition for a multilayer ceramic capacitor, which has temp. characteristics of the capacitance satisfying B- characteristics and X7R-characteristics and the dielectric constant of not less than 2,500 and which exhibits that the product of the insulation resistance and the capacitance is not less than 5,000 Ω.F when 4 kVDC/mm is applied at the room temp., and further which is excellent in reliability even when it is made thin layer. CONSTITUTION: The dielectric ceramic composition is a complex oxide which contains, as a main component, barium titanate and, as sub-components, R (R is at least one of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb), Ca, Mg and Si. When the complex oxide is expressed by the formula; 100BamTiO3+ aRO3/2+bCaO+cMgO+dSiO2 (wherein the unit of the coefficient 100, (a), (b), (c), or (d) is mole), (m), (a), (b), (c) and (d) are each given by the following relation: 0.990 <= m <= 1.030, 0.5 <= a <= 6.0, 0.10 <= b <= 5.00, 0.010 <= c <= 1.000 and 0.05 <= d <= 2.00.
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