Abstract
A simple one-step cation-exchange reaction between the stoichiometric solutions of ammonium titanyl oxalate (ATO) and barium hydroxide+strontium nitrate at room temperature (RT) is investigated successfully for the quantitative precipitation of barium–strontium titanyl oxalate (BSTO): Ba 1− x Sr x TiO(C 2O 4) 2·4H 2O ( x=0.25) precursor powders with nearly theoretical yield (≥99%). The pyrolysis of BSTO at 730 °C/4 h in air produced barium–strontium titanate (Ba 1− x Sr x TiO 3; BST) powders. The characterization studies on BSTO and BST powders by using various physico-chemical techniques: micro- and chemical analysis, differential thermal analysis (DTA)/thermo-gravimetric analysis (TGA), XRD, FTIR, X-ray fluorescence (XRF) and scanning electron microscopy (SEM) revealed that the powders formed are cubic, highly pure, stoichiometric and sub-micron-sized with nearly uniform size and shape distribution. The ceramic compacts obtained by sintering the BST pellets at 1300 °C/4 h showed density ∼95%, dielectric constant ɛ(Tc)∼9500, tan δ∼0.15% and T C∼32 °C.
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