Wong, Chui LingMadhavi, SPhonthammachai, NWhite, Timothy2015-12-130022-4596http://hdl.handle.net/1885/71931(Ba,Sr) 2TiSi 2O 8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO 3 perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGADGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba 2TiSi 2O 8 (BTS) and Sr 2TiSi 2O 8 (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO 3, (Ba,Sr)TiO 3 and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders.Keywords: Chemical evolution; Complexing agents; Endmembers; Fresnoites; FTIR; High surface area; Homogeneous distribution; Isothermal reactions; Pechini; Pechini process; Phase development; Quantitative x ray diffraction; Secondary phase; TiO; Calcination; Citric Ba 2TiSi 2O 8; Fresnoite; Pechini process; Sr 2TiSi 2O 8201210.1016/j.jssc.2011.12.0312016-02-24