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Study of synthesis and morphology of BaTiO3 crystals prepared from molten salts

The synthesis of barium-titanium mixed oxide, BaTiO 3 , from the mixture of barium sulphate, sodium carbonate and titanium oxide in the medium of the molten alkali metal chlorides was realized at the temperatures of 700-900 o C and reaction times of 1-30 min. The conversion degree increases both with temperature and time of heating and in the presence of flux attains at 900 o C almost 100%. The synthesized powders contained BaTiO 3 crystals of two different morphology. The equiaxed BaTiO 3 crystals originate most probably by disintegration of the primarily formed rod-like crystals. According to the X-ray diffraction analysis all prepared powders contain only the tetragonal modification of BaTiO 3 . The activation energy of the BaTiO 3 formation was found to be ΔE (BaTiO 3 )=124.6 kJ/mol