Dielectric ceramic composition, preparation method therefor, and dielectric resonator
AssigneeKYOCERA Corporation
InventorYoshihiro Okawa
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Abstract
There is provided a dielectric ceramic composition containing metal elements Ca, Ti, La, Zn and M which is at least one metal element selected from the group consisting of W, Ni, Co, Zr, Sn, Mn and Cu, and represented on a molar fraction basis by the following composition formula: aCaO.multidot.bTiO.sub.2 .multidot.cLa.sub.2 O.sub.3 .multidot.dZnO.multidot.eMO.sub.x wherein 1.ltoreq.x.ltoreq.3, and a to e are molar fractions which are each set within a predetermined range. The composition has a high dielectric constant, a high Q value and a stably low resonant frequency temperature coefficient .tau.f.
Claims10
A dielectric ceramic composition containing metal elements Ca, Ti, La, Zn and M which is at least one metal element selected from the group consisting of W, Ni, Co, Zr, Sn, Mn and Cu, and represented on a molar fraction basis by the following composition formula:
- aCaO.multidot.bTiO.sub.2 .multidot.cLa.sub.2 O.sub.3 .multidot.dZnO.multidot.eMO.sub.x
- wherein M is defined above;
- 1.ltoreq.x.ltoreq.3;
- and a to e are molar fractions which are defined as 0.050.ltoreq.a.ltoreq.0.320, 0.150 .ltoreq.b.ltoreq.0.470, 0.100.ltoreq.c.ltoreq.0.300, 0.100.ltoreq.d.ltoreq.0.300 and 0<e.ltoreq.0.250, respectively (a+b+c+d+e=1).
Dependencies are inferred from the claim text.