| 摘要 |
PURPOSE: To obtain a dielectric porcelain composition having a high relative permittivity and a low dielectric loss at a relatively low baking temperature by using barium titanate as a principal component and including Nb2 O5 , MgO, La2 O3 , MnO and ZnO at specific ratios therein. CONSTITUTION: This dielectric porcelain composition contains 100 pts.wt. BaTiO3 , 0.8-2.5 pts.wt. Nb2 O5 , 0.06-0.70 pt.wt. MgO, 0.005-0.520 pt.wt. La2 O3 , MnO in an amount of 0.01-0.30 pt.wt. expressed in terms of MnCO3 and 0.01-0.5 pt.wt. ZnO at a molar ratio of the Nb2 O5 to the total content of ZnO and MgO within the range of 0.5-2.2. The composition has >=2500 relative permittivity, <=1300 deg.C baking temperature, a temperature change in electrostatic capacity satisfying the X7R of the Electronic Industries Association(EIA) Standards, a dielectric loss as low as <=2.5, a small voltage dependence and >=10<4> MΩ insulation resistance. Thereby, this composition copes with a smaller size and a larger capacity of a dielectric porcelain. |
