| 摘要 |
A dielectric ceramic composition wherein the dielectric constant ∈ is large, the temperature coefficient tauf of the resonance frequency is close to 0, and which as a large Q value, is obtained by adding to and blending with a ceramic composition whose tauf of the resonance frequency is large on the plus side a ceramic composition whose temperature coefficient tauf is large on the minus side. In an Li2O-R2O3-TiO2-based composition, an improved dielectric constant ∈ can be achieved by introducing a specific quantity of Bi2O3, and tauf can be shifted to the plus side and in addition a considerable improvement in Qf achieved by introducing a specific quantity of MO, where M is one or two of Ca and Sr. Furthermore, by introducing a specific quantity of Na2O together with the MO (where M is one or two of CA and Sr), in particular in the case of material of ∈r>150, it is possible to control tauf to the vicinity of 0 while maintaining Qf at an high value.
|
