| 简介 |
[PROBLEMS] To provide a multilayered ceramic capacitor which in a high-temperature loading test, can be inhibited from decreasing in insulation resistance with time and which can have high insulating properties even when produced without via a reoxidation step. [MEANS FOR SOLVING PROBLEMS] The multilayered ceramic capacitor is formed by alternately superposing dielectric layers made of dielectric porcelain and inner-electrode layers. The dielectric porcelain is constituted of first crystals comprising crystal particles comprising barium titanate as the main component and having a calcium concentration of 0.2 at.%% or lower and second crystals comprising crystal particles having a calcium concentration of 0.4 at.%% or higher. The ratios (C2/C1) between the concentrations (C1) of magnesium and rare earth elements in a surface layer of the crystal particles constituting the first crystals and the concentrations (C2) of magnesium and the rare earth elements in a central part of the crystal particles (9a) constituting the first crystals are higher than the corresponding concentration ratios (C4/C3) in the crystal particles (9b) constituting the second crystals. When the areal proportion of the crystal particles of the first crystals and that of the crystal particles of the second crystals are expressed by a and b, respectively, then b/(a+b) is 0.5-0.8.© KIPO & WIPO 2009 |
客服热线：
手机版
二维码
