| 摘要 |
An oxide having a perovskite structure, for example, barium titanate is provided, in which a particle diameter is as small as 0.03 to 0.2 mu m, an amount of OH groups in a crystal lattice is less than 0.2% by weight, a c/a axial ratio is as large as 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 10 m<2>/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 2 x 10<3> Pa or less and more than 2 x 10<2> Pa, the heat treatment is performed at a temperature within the range 700 to 1100 DEG C, and in the case in which a partial pressure of oxygen is decreased to 2 x 10<2> Pa or less, the heat treatment is performed at a temperature within the range 600 to 1100 DEG C. <IMAGE> |
