| 摘要 |
PURPOSE:To provide a dielectric ceramic composition having a high dielectric constant, a small dielectric loss, large dielectric breakdown voltage and insulation resistance, and a small crystal grain see by specifying the composition of BaO, SrO, TiO2, and GdO3/2. CONSTITUTION:A dielectric porcelain composition is expressed by the general formula x[(BaO)1-m(SrO)m].yTiO2.zGdO3/2, where the value of (m) is 0.005<=m<=0.100, (x), (y), (z) indicate mol%, x+y+z=1, and values of (x), (y), (z) are within the range of mol% surrounded by (a), (b), (c), (d) shown by the table in the ternary diagram, and the dielectric ceramic composition can be made thin without increasing the dielectric loss. Nb2O5 of 0.3-3.0 pts.wt. can be added to this composition as required. When BaO in xBaO.yTiO2.zGdO3/2 of the porcelain composition is substituted with SrO having the prescribed substitution ratio (m), the dielectric loss is reduced, and the product of the static capacity and the insulation resistance is increased with no large change of the dielectric constant and the dielectric breakdown strength. |
