Co-precipitation method for the preparation of ferroelectric CaBi_(4)Ti_(4)O_(15)

摘要

A simple co-precipitation technique has been successfully applied for the preparation of pure single phase CaBi_(4)Ti_(4)O_(15) (CBT) powders. Ammonium oxalate and ammonium hydroxide were used to precipitate Ca~(2+), Bi~(3+) and Ti~(4+) cations simultaneously. No pyrochlore phase was found while heating powder at 600℃ and pure CBT phase was found to be formed by X-ray diffraction. Particle size and morphology was studied by transmission electron microscopy (TEM). The room temperature dielectric constant at 1 kHz is 400. The ferroelectric hysteresis loop parameters of these samples were also studied.