فهرست نشریات علمی دسترسی آزاد ایران

Strontium titanate (SrTiO 3 ) was synthesized by mechanochemical processing of a mixture of purified celestite concentrate and titanium dioxide. First, SrCO 3 was prepared from a mixture of purified celestite concentrate and sodium carbonate via a mechanochemical method, then SrTiO 3 synthesizes from a stoichiometric mixture of SrCO 3 and TiO 2 powder. After isothermal heating of a 5-h milled mixture of SrCO 3 -TiO 2 powder at 900 ℃ for 2 h, a single phase of SrTiO 3 with a cubic structure was produced. The synthesized SrTiO 3 powders were sintered at different temperatures for 2 h. The produced SrTiO 3 samples were characterized using SEM micrographs, and the phase changes were evaluated using XRD analyses. The changes in the density and dielectric constant of the sintered samples were also determined. The results showed that the properties of SrTiO 3 highly depended on the sintering temperature. Owing to the microstructure and grain size of the produced SrTiO 3 in the milled samples, the dielectric constant of the milled sample was lower than that of the un-milled sample.