Synthesis of Ferroelectric Bi1/2Na1/2TiO3 Fine Powder through the Solid State Reaction Technique

Abstract

Solid solutions of Bi_1/2Na_1/2TiO₃ (symbolized as BNT) were successfully prepared by means of solid state reaction technique. The effects of processing parameters on the growth and morphology of derived Bi_1/2Na_1/2TiO₃ powders were investigated. The BNT powders were synthesized in a stoichiometric ratios of raw oxide and carbonate powers (Bi₂O₃, TiO₂, and Na₂CO₃) at an optimized temperature of 850-900 ⁰C. X-ray diffraction pattern of NBT compounds revealed the hexagonal crystal structure. The lattice parameters vary with optimization condition of sintering temperature. Density of the prepared samples was found to be average 84-90 % of their theoretical values. The relationship between temperature & frequency dependent dielectric constant and loss studies are also investigated in this research paper.