Co-Precipitation Synthesis and Characterization of SrBi2Ta2O9 Ceramic

Abstract

Strontium bismuth tantalate (SrBi 2 Ta 2 O 9 ) was synthesized by a co-precipitation method. The sample was characterized by x-ray powder diffraction patterns (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results of the dielectric properties are reported at room temperature. No secondary phases were found while heating the powder at 850°C and the pure SrBi 2 Ta 2 O 9 phase was formed, as revealed by XRD. The characteristic bands for SrBi 2 Ta 2 O 9 were observed by FTIR at approximately 619 cm À1 and 810 cm À1 . SEM micrographs for the sample displayed thin plate-like grains. The grain size was less than 1 lm and the crystallite size of about 24 nm. Dielectric response at room temperature shows that the SrBi 2 Ta 2 O 9 ceramic has low loss values, and the flattening of the dielectric constant at higher frequencies. The observed Curie temperature is comparable with those reported in the literature.