Pure barium titanate BaTiO_3 (BT) and BT doped with two different transition elements Fe^{3+} and Ni^{2+} at 5 mol.% (BT5Fe and BT5Ni, respectively) as constant concentration in powder form have been prepared by sol-gel method using barium acetate, titanium(IV) n-butoxide, iron and nickel nitrates as precursor materials. The microstructure of BT and the influence of Fe and Ni dopants on it were investigated by X-ray diffraction and Fourier transform infrared spectroscopy. X-ray diffraction shows that tetragonal phase is dominant for pure BT sintered for 4 h at 800°C. Scanning electron microscopy and transmission electron microscopy were used to study surface morphology and particle size distribution for BT5Fe and BT5Ni, respectively. The presence of hydroxyl defects were verified by Fourier transform infrared spectroscopy for (BaTi_{1-x}Fe_{x}O_{3-x/2}) (BT_xFe), where x=0.005, 0.01, 0.05, and 0.07 and (BaTi_{1-x}Ni_{x}O_{3-x/2}) (BT_xNi), where x=0.005, 0.01, 0.03, 0.05, and 0.07.
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