Synthesis of Sr_(0.5)Ba_(0.5)Nb_2O_6 by urea method

摘要

A precipitate was formed when an aqueous solution of SrCl_2, BaCl_2, NbF_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 750 deg C yielded the nanocrystallites of ternary oxide, Sr_(0.5)Ba_(0.5)Nb_2O_6 (SBN) as confirmed by X-ray diffraction study (XRD). This is much lower temperature as compared to that prepared by traditional solid state method (1000 deg C) as reported for the formation of SBN ceramics. Transmission electron microscope (TEM) investigations revealed that the average particle size is 100 nm for the calcined powders. The room temperature dielectric constant at 1 kHz is found to be 1050. The ferroelectric hysteresis loop parameters of these samples were also studied.