Dielectric Properties of Bismuth Doped Barium Titanate (BaTiO3) Ceramics

Abstract

Abstract: The dielectric properties of bismuth doped barium titanate ceramics were investigated. The powders were prepared using the solid-state reaction method. The dielectric properties were characterized by means of LCR meter. XRD clearly revealed only a momophasic perovskite of tetragonal asymmetry for the reference BaTiO 3 , which was established to possess both a-a-and a-c-type 90 o domains. Examination of dielectric constant revealed a significant increase with increasing sintering temperature. Furthermore, sintering temperature has been shown to produce a linear increasing in the density. Nevertheless, an increase in the sintering temperature did not show any evidence of a change in transition temperature. The maximum transition temperature of this system was 135 °C at with the relative permittivity of 3500 at 1 kHz. Above the Curie temperature the relative permittivity follows Curie-Weiss law with Curie constant C = 1.8 x 10 5 o