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Abstract
Sol–gel processing has been refined to prepare lanthanum doped barium titanate nanosize polycrystal powders, LaxBa1-xTiO3 (x=0.05, 0.15, 0.20, 0.25), in the presence of Ba(OAc)2, La(OAc)3, and Ti(OnBu)4 as starting materials with 0.7 mol L-1 total concentration of precursor. The sol was obtained by cosolubilised hydrolysis of starting materials using HOAc as medium and catalysis with pH∼3.8. The wet gel was acquired by concentrating and aging at room temperature. The wet gel to dry gel conversion was carried out at 50°C for ∼24 h. First the dry gel was characterised by differential thermal analysis–thermal gravimetry (DTA–TG) and then it was calcined at various temperatures (600, 700, 800, 900°C) to prepare the nanocrystals. The final synthesised polycrystals were characterised by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction, and scanning electron microscopy.
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