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Dielectric ceramic and laminated ceramic capacitor

2025-06-17 15:073980下载
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To provide a dielectric ceramic, which has high permittivity, has specific permittivity which varies depending upon temperature so as to satisfy X5R characteristics in EIA specifications, and can realize high insulation resistance even in the case of low applied voltage, and a laminated ceramic capacitor which comprises the dielectric ceramic as a dielectric layer and is excellent in service life properties in a high-temperature load test. A dielectric ceramic composed mainly of barium titanate having a different Ca concentration. The dielectric ceramic contains, based on 100 moles of barium constituting the dielectric ceramic, 0.05 to 0.3 mole, in terms of V2O5, of vanadium, 0 to 1 mole, in terms of MgO, of magnesium, 0 to 0.5 mole, in terms of MnO, of manganese, and 0.4 to 1.5 moles, in terms of RE2O3, of a rare earth element (RE) selected from yttrium, dysprosium, holmium, and erbium. In an X-ray diffraction chart of the dielectric ceramic, the diffraction intensity of (004) plane, which shows tetragonal barium titanate, is larger than the diffraction intensity of (400) plane which shows cubic barium titanate.


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