A precipitate was formed when a aqueous solution of CaCl 2 , BiCl 3 , TaF 5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600°C yielded the nanocrystallites of ternary oxide CaBi 2 Ta 2 O 9 (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (P r ) and coercive field (E C ) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70nm. The room temperature dielectric constant was found to be 110.