| 摘要 |
PROBLEM TO BE SOLVED: To enable a dielectric ceramic composition to be baked at a comparatively low temperature at which an internal electrode is not eluted and further to improve temperature characteristics such as X7R and B-characteristic, a ceramic density, and a relative dielectric constant by externally adding Nb2DO3, ZnO, Tb4O7, SiO2 and B2O3 in specific proportions to BaTiO3. SOLUTION: This dielectric ceramic composition is obtained by externally adding 0.8-2.0 pts.wt. Nb2O3, 0.3-0.8 pt.wt. ZnO, 0.2-0.9 pt. wt. Tb4O7, and 0.1-2.0 pts.wt. (SiO2+B2O3), preferably in a proportion satisfying the equation 0<B2 O3/(SiO2+B2O3)<=0.3. The composition can be baked at <=1,200 deg.C at which the internal electrode is not eluted when producing a laminated type ceramic capacitor by using the internal electrode of silver or the like. The composition has good sintering properties and can provide a high ceramic density of about >=5.72 g/cm3. Further, the ceramic composition has a small rate of change by the temperature, satisfying X7R and B-characteristic within the temperature range of (-55)-125 deg.C, and a high relative dielectric constant of about 3,300 or more. |
