ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 38, (3) 163 - 165 (1994)


STUNY OF SYNTHESIS AND MORPHOLOGY OF BaTiO₃ CRYSTALS PREPARED FROM MOLTEN SALTS
 
Lubyová Želmíra, Daněk Vladimír
 
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava, Slovakia

The synthesis of barium-titanium mixed oxide, BaTiO₃, 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 °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 °C almost 100%. The synthetized powders contained BaTiO₃ crystals of two different morphology. The equiaxed BaTiO₃ 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 BaTiO₃. The activation energy of the BaTiO₃ formation was found to be ΔE(BaTiO₃) = 124.6 kJ/mol.


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