Synthesis and Characterization of Bismuth Sodium TitanateBarium Titanate Ceramics

Abstract

Ferroelectric ceramics have always been a area of huge attention, in the era of science.These ceramics have pyroelectric, piezoelectric, dielectric and ferroelectric properties which make them suitable for multifunctional device applications. Among the lead-free ferroelectric ceramics, (Na0.5Bi0.5)TiO3(NBT) has extremely good properties with a relatively large Pr (~ 38μC/cm2 ) and a high Ec (~ 73 kV/cm), high Curie temperature Tc ~320 °C with diffuse phase transition and a moderate piezoelectric coefficient (d33) ~73pC/N. In the present work, (1-x) (Bi0.5Na0.5)TiO3 (BNT) - x BaTiO3 (BT) where (x= 0, 0.1, 0.2, 0.3) ceramics were prepared via solid-state reaction method. X-ray diffraction pattern revealed the perovskite phase with small amount of secondary phase Na0.5Bi4.5Ti4O15.The SEM micrograph show ed dense microstructure and non-uniform grain size. Dielectric and impedance properties of the samples were measured at temperatures ranging from (50 ℃ to 500 ℃) at various applied frequency ranging from 100Hz to 1MHz.