Influence of Bismuth Oxide on Dielectric Properties of Barium Titanate Solid Solution

Abstract

A Ba 0.9 Bi 0.1 TiO 3 solid solution was prepared by substituting 0.1 mole % Bi 2 O 3 at the Ba 2+ sites in BaTiO 3 , and its dielectric properties were investigated. The Ba 0 . 9 Bi 0 . 1 TiO 3 solid solution was sintered at 1310 ∘ C for 5 h. The stable formation of the perovskite structure was confirmed through X-ray diffraction, energy-dispersive X-ray spectroscopy, and field emission scanning electron microscopy. Unlike pure BaTiO 3 , pyrochlore Bi 2 Ti 2 O 7 was observed in Ba 0 . 9 Bi 0 . 1 TiO 3 at approximately 27.1 ∘ . Overall, the perovskite structure was well formed. The Ba 0 . 9 Bi 0 . 1 TiO 3 solid solution showed typical dielectric properties and followed the modified Curie–Weiss law. In addition, the curve of the dielectric constant vs. temperature showed an extremely gradual change compared to the phase transition behavior of BaTiO 3 .