Characterization of Synthesized SrTiO۳ from Purified Celestite Concentrate Using Mechanochemical Process

Strontium titanate (SrTiO۳) was synthesized by mechanochemical processing of a mixture of purified celestite concentrate and titanium dioxide. First, SrCO۳ was prepared from a mixture of purified celestite concentrate and sodium carbonate via a mechanochemical method, then SrTiO۳ synthesizes from a stoichiometric mixture of SrCO۳ and TiO۲ powder. After isothermal heating of a ۵-h milled mixture of SrCO۳-TiO۲ powder at ۹۰۰ ℃ for ۲ h, a single phase of SrTiO۳ with a cubic structure was produced. The synthesized SrTiO۳ powders were sintered at different temperatures for ۲ h. The produced SrTiO۳ 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 SrTiO۳ highly depended on the sintering temperature. Owing to the microstructure and grain size of the produced SrTiO۳ in the milled samples, the dielectric constant of the milled sample was lower than that of the un-milled sample.

کلیدواژه ها:

Ball milling ، Celestite concentrate ، Perovskite ، Strontium carbonate ، Strontium titanate