DIELECTRIC CERAMICS AND LAMINATED CERAMIC CAPACITOR

摘要

This invention provides a dielectric ceramic composed mainly of a BaTiO3-based compound and is represented by general formula [100AmBO3 + aNiO + bROn + cMOV + dMgO + eXOW] wherein R represents a rare earth element such as Dy; M represents a metal element such as Mn; and X represents a Si-containing sintering aid component). Nickel is solid-solutioned homogeneously into crystal grains, and the solid solution zone of the rare earth element in the crystal grains is 10% or less on average in terms of the cross sectional area ratio. The dielectric ceramic satisfies 0.96 = m = 1.030, 0.05 = a = 3, 0.1 = b = 1.5, 0.1 = c = 1.0, 0.1 = d = 1.5, and 0.05 = e = 3.5. In the laminated ceramic capacitor, dielectric layers (1a) to (1g) are formed of the dielectric ceramic. The above constitution can realize a dielectric ceramic and a laminated ceramic capacitor, which have good AC voltage characteristics and can maintain desired dielectric characteristics and good temperature characteristics, and further have good withstand voltage properties and can ensure reliability.