Dielectric ceramic composition, multilayer complex electronic device, multilayer common mode filter, multilayer ceramic coil and multilayer ceramic capacitor
A dielectric ceramic composition comprises as a main component, Cu oxide, Si oxide and one selected from the group consisting of Zn oxide alone and a combination of Mg oxide and Zn oxide, as a subcomponent, a glass component including B oxide and at least one selected from the group consisting of Si oxide, Ba oxide, Ca oxide, Sr oxide, Li oxide and Zn oxide, and having a glass softening point is 750° C. or less, wherein a content of said glass component is 1.5 to 15 wt % with respect to 100 wt % of said main component. According to the present invention, a dielectric ceramic composition can be provided which is available to be sintered at low temperature (for example, 950° C. or lower) while comparatively decreasing contents of a glass component, which shows good properties (specific permittivity, loss Q value and insulation resistance), and which is available to perform cofiring different materials.
1. A dielectric ceramic composition comprising;
as a main component, Cu oxide, Si oxide, Mg oxide and Zn oxide,
as a subcomponent, a glass component including B oxide and at least one selected from the group consisting of Si oxide, Ba oxide, Ca oxide, Sr oxide, Li oxide and Zn oxide, and having a glass softening point is 750° C. or less, wherein;
a content of said glass component is 1.5 to 15 wt % with respect to 100 wt % of said main component:
the composition includes crystal phase comprising crystal structure of forsterite and willemite: and
when said main component is shown by a general formula
a ( b MgO. c ZnO. d CuO).SiO2,
a is 1.5 to 2.4, c is 0.10 to 0.92, d is 0.02 to 0.18, wherein b+c+d=1.00 and b>0.
2. A multilayer complex electronic device comprising;
a coil portion constituted by a coiled conductor and a non-magnetic layer, and
a capacitor portion constituted by an internal electrode layer and a dielectric layer, wherein;
said coiled conductor and/or said internal electrode layer include(s) Ag as a conductive material,
said non-magnetic layer is constituted by the dielectric ceramic composition as set forth in claim 1 .
3. A multilayer common mode filter comprising;
a filter portion constituted by a coiled conductor and a non-magnetic layer, and
an external layer portion constituted by a magnetic layer, wherein;
said coiled conductor includes Ag as a conductive material,
said non-magnetic layer is constituted by the dielectric ceramic composition as set forth in claim 1 .
4. A multilayer complex electronic device comprising;
a capacitor portion constituted by an internal electrode layer and a dielectric layer,
a common mode filter portion comprising a coiled conductor and a non-magnetic layer, and
an external layer portion constituted by a magnetic layer, wherein;
said coiled conductor and/or said internal electrode layer include(s) Ag as a conductive material,
said non-magnetic layer is constituted by the dielectric ceramic composition as set forth in claim 1 .
5. A multilayer ceramic coil comprising;
a coil portion constituted by stacking a coiled conductor and a non-magnetic layer, wherein;
said coiled conductor includes Ag as a conductive material,
said non-magnetic layer is constituted by the dielectric ceramic composition as set forth in claim 1 .
6. A multilayer ceramic capacitor comprising,
an element body wherein an internal electrode layer and a dielectric layer are alternately stacked, wherein;
said internal electrode layer includes Ag as a conductive material, said dielectric layer is constituted by the dielectric ceramic composition as set forth in claim 1 .