DIELECTRIC CERAMIC AND CAPACITOR

摘要

Disclosed is a dielectric ceramic comprising crystal grains mainly composed of barium titanate. This dielectric ceramic contains 0.01-0.06 mole of magnesium in terms of MgO, 0.0007-0.03 mole of yttrium in terms of Y<SUB>2</SUB>O<SUB>3</SUB> and 0.0002-0.03 mole of manganese in terms of MnO per 1 mole of barium constituting the barium titanate, while containing 4.2-33.3 parts by mass of niobium in terms of Nb<SUB>2</SUB>O<SUB>5</SUB> per 100 parts by mass of the barium titanate. The crystal grains have an average particle size of 0.05-0.25 µm. Also disclosed is a capacitor composed of a laminate having a conductive layer and a dielectric layer made of such a dielectric ceramic.