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US 2001/0040784 A1Published application
Nonreducing dielectric ceramic and monolithic ceramic capacitor using the same
AssigneeMurata Manufacturing Co., Ltd.
InventorsMasahiro Naito, Tomoo Motoki, Harunobu Sano
Life of this patent
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Abstract
A nonreducing dielectric contains a main-component having a perovskite crystal phase and satisfying the formula (Ca1-a-b-cSraBabMgc)m(Zr1-w-x-y-zTiwMnxNiyHfz)O3 and a compound oxide represented by the formulae (Si, T)O2—MO—XO and (Si, T)O2—(Mn, M′)O—Al2O3. The ratio of the intensity of the maximum peak of a crystal phase not of the perovskite crystal phase to the intensity of the maximum peak assigned to the perovskite crystal phase appearing at 2θ=25 to 35° is about 5% or less in a CuKα X-ray diffraction pattern.
Claims20
A nonreducing dielectric ceramic comprising;
- a main-component having a perovskite crystal phase, the main-component satisfying the formula (Ca1-a-b-cSraBabMgc)m(Zr1-w-x-y-zTiwMnxNiyHfz)O3 wherein 0≦a<0.5, 0≦b<0.5, 0≦c<0.05, 0≦a+b+c<0.5, 0.98≦m<1.03, 0≦w<0.6, 0≦x<0.05, 0≦y<0.05, 0≦z<0.3, 0≦x+y≦0.05, and 0≦w+x+y+z<0.6;
- and
- at least one compound oxide selected from the group consisting of (Si, T)O2—MO—XO and (Si, T)O2—(Mn, M′)O—Al2O3, wherein T is at least one of Ti and Zr, MO is at least one of MnO and NiO, XO is at least one member selected from the group consisting of BaO, SrO, CaO and MgO, and M′ is at least one member selected from the group consisting of Ni, Ba, Sr, Ca and Mg;
- wherein the ratio of the intensity of the maximum peak of the crystal phases other than the perovskite crystal phase to the intensity of the maximum peak assigned to the perovskite crystal phase appearing at 2θ=25 to 35° in a CuKα X-ray diffraction pattern is about 5% or less.
1 more element
Dependencies are inferred from the claim text.