| 简介 |
PROBLEM TO BE SOLVED : To provide a dielectric porcelain exhibiting a high dielectric constant and stable temperature properties in a specific dielectric constant and having reduced spontaneous polarization and to provide a capacitor using it.
SOLUTION : The dielectric porcelain comprises crystal grains containing barium titanate as a main ingredient, calcium, magnesium, a rare earth element and manganese and grain boundary phases and contains calcium of 0.1 mole or less in terms of CaO, magnesium of 0.01-0.064 mole in terms of MgO, a rare earth element of 0.0015-0.03 mole in terms of RE2O3 and manganese of 0.0002-0.03 mole in terms of MnO to titanium 1 mole constituting barium titanate. The crystal structure of the dielectric ceramic identified by X-ray diffraction is mainly cubic. The average crystal grain diameter of the crystal grains is 80-200 nm.
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