Abstract
Barium titanate is the most general ferroelectric material which is widely studied in physics and application. The origin of large ferroelectricity is known to be the strong Ti-O covalency of perovskite-type BaTiO3. Therefore, the substitution of oxygen by fluorine which has the largest electronegativity can control the Curie temperature. In the present article, we show “the large annealing effect on TC due to the evaporation of fluorine from the crystal” and “Critical phenomena in KF-substituted BaTiO3 probed by inelastic light scattering”.
