| 摘要 |
PURPOSE: To heighten the specific dielectric constant, lessen the rate of temp. change, and perform a low temp. baking below a specified temp. by mixing Nb2 O5 , ZnO, Y2 O3 , and SiO2 in respectively specified contents with respect to 100 parts by wt. BaTiO3 . CONSTITUTION: As material to a dielectric porcelain compound, oxide powders of BaTiO3 and also Nb2 O5 , ZnO, Y2 O3 , SiO2 , and MnO are used, and the purity of each oxide substance is made over 99.5%. With respect to 100 parts by wt. BaTiO3 , 0.8-2.0 parts by wt. Nb2 O5 , 0.3-0.8 parts by wt. ZnO, 0.1-0.6 parts by wt. Y2 O3 , and 0.1-2.0 parts by wt. SiO2 are mixed. This leads to heightening the dielectric constant and lessening the rate of temp. change so that the thermal characteristics in -55 deg.C to +125 deg.C meet the X7R, B characteristics, and also it is possible to perform a low temp. baking process at under 1200 deg.C. Further the dielectric resistance value can be heightened by including MnO less than 0.3 parts by wt. with respect to 100 parts by wt. BaTiO3 . |
