Dielectric Properties of La Doped-Hexagonal BaTiO₃ Single Crystal Grown by FZ Method

Abstract

The oxygen-deficient hexagonal BaTiO₃ shows huge dielectric constant. Because of the oxygen-deficient induced to change the valance from Ti⁴⁺ to Ti³⁺ and formed the charge imbalance in a lattice. However, this dielectric constant is easily disappeared when the oxygen-deficient is compensated. And it is difficult to control the amount of oxygen-deficient in hexagonal BaTiO₃. In this study, the oxygen deficient is substituted by La to keep the charge imbalance. It was successful to retain the huge dielectric constant of La doped hexagonal BaTiO₃. La³⁺ could induce to change the valance from Ti⁴⁺ to Ti³⁺. And it shows almost the same behavior on the complex plane of Z by an impedance measurement. La doped hexagonal BaTiO₃ has a semiconductive behavior.

Keywords:

• Hexagonal barium titanate
• dielectric property
• oxygen deficient
• lanthanum
• dielectric constant