Characterization of Synthesized SrTiO3 from Purified Celestite Concentrate UsingMechanochemical Process

Strontium titanate (srtio3) was synthesized bymechanochemical processing of a mixture of purified celestite concentrateand titanium dioxide. first, srco3 was prepared from a mixture of purifiedcelestite concentrate and sodium carbonate via a mechanochemical method,then srtio3 synthesizes from a stoichiometric mixture of srco3 and tio2powder. after isothermal heating of a 5-h milled mixture of srco3-tio2powder at 900 ℃ for 2 h, a single phase of srtio3 with a cubic structurewas produced. the synthesized srtio3 powders were sintered at differenttemperatures for 2 h. the produced srtio3 samples were characterizedusing sem micrographs, and the phase changes were evaluated using xrdanalyses. the changes in the density and dielectric constant of the sinteredsamples were also determined. the results showed that the properties ofsrtio3 highly depended on the sintering temperature. owing to themicrostructure and grain size of the produced srtio3 in the milled samples, the dielectric constant of the milled sample was lower than thatof the un-milled sample.