DIELECTRIC CERAMIC AND MULTILAYER CERAMIC CAPACITOR USING THE SAME

文件类型：PDF文档
文件大小：486K
Disclosed is a dielectric ceramic having crystal grains mainly composed of barium titanate and an intergranular phase present among the crystal grains. The dielectric ceramic contains, per 100 moles of barium constituting the barium titanate, 0.05-0.3 mole of vanadium in terms of V2O5, and 0.5-1.5 moles of one rare earth element (RE) selected from yttrium, dysprosium, holmium and erbium in terms of RE2O3. The crystal grains are composed of a first group of crystals consisting of crystal grains having a calcium concentration of not more than 0.2 atom%, and a second group of crystals consisting of crystal grains having a calcium concentration of not less than 0.4 atom%. In an x-ray diffraction chart of the dielectric ceramic, the diffraction intensity of the (004) plane indicating tetragonal barium titanate is higher than the diffraction intensity of the (400) plane indicating cubic barium titanate. The dielectric ceramic has a Curie temperature of 100-120?C.