Oxide having perovskite structure, barium titanate, and manufacturing method therefor, dielectric ceramic, and ceramic electronic component

摘要

An oxide having a perovskite structure, for example, barium titanate, is provided in which the particle diameter is as small as about 0.03 to 0.2 &mgr;m, the amount of OH groups in the crystal lattice is less than about 0.2% by weight, the c/a axial ratio is as large as about 1.0033 or more and sufficient ferroelectricity is exhibited. Barium titanate is produced with steps of mixing a BaCO₃ powder and a TiO₂ powder having a specific surface area of about 10 m²/g or more and heat-treating the mixed powder. In the heat treatment, in the case in which a partial pressure of oxygen is decreased to about 2×10³ Pa or less and more than about 2×10² Pa, the heat treatment is performed at a temperature within the range of about 700 to 1100° C., and in the case in which a partial pressure of oxygen is decreased to about 2×10² Pa or less, the heat treatment is performed at a temperature within the range of about 600 to 1100° C.