Synthesis and Dielectric Properties of Bismuth Doped Barium Titanate (BaTiO3) Ceramics
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 monophasic perovskite of tetragonal asymmetry for the reference BaTiO3, which was
established to possess both a-a- and a-c-type 90o 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 the transition
temperature. The maximum transition temperature of this system was 135 ??C with the
relative permittivity of 3500 at 1 kHz. Above the Curie temperature the relative permittivity
follows the Curie-Weiss law with the Curie constant C = 1.8 x 105 oC.
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 monophasic perovskite of tetragonal asymmetry for the reference BaTiO3, which was
established to possess both a-a- and a-c-type 90o 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 the transition
temperature. The maximum transition temperature of this system was 135 ??C with the
relative permittivity of 3500 at 1 kHz. Above the Curie temperature the relative permittivity
follows the Curie-Weiss law with the Curie constant C = 1.8 x 105 oC.
Keywords: BaTiO3, Ferroelectricity, Phase transitions
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