Synthesis of bismuth titanate by the urea method

摘要

A simple urea precipitation route was adopted for the preparation of bismuth titanate (Bi_4Ti_3O_(12)) powders. Stoichiometric quantities of Bids and TiOCl_2 were mixed with the required amount of urea (the ratio of total metal cations to urea is five), and the mixture was heated on a water bath. This leads to the formation of precipitate, which was decomposed at 973 K. The formation of bismuth titanate was observed on calcining powders at 973 K by X-ray diffraction studies. The average particle size is found to be 100 nm by microscopy. The room temperature dielectric constant is found to be 150 at 1 kHz. The hysteresis loop parameters were also obtained by home-built Sawer-Tower circuit