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KMID : 1059519890330010065
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Journal of the Korean Chemical Society
1989 Volume.33 No. 1 p.65 ~ p.69
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A Study on the Characterization of Barium Titanate by a Radiometric Method (Ⅰ). Synthesis of Barium Titanate by an Oxalate Method
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Lee Chul
Shin Yong-Kyun
Chung Koo-Soon
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Abstract
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Barium titanyl oxalate was synthesized by adding ethanol solution of oxalic acid to the mixed aqueous solution which contained barium or lanthanum radiotracers in addition to Ba(NO3)2 and TiO(NO3)2. The oxalate was finally converted to BaTiO3 by calcination at 1000℃ in air. The chemical formula of the oxalate was confirmed to be BaTiO(C2O4)2·4H2O by the thermal analysis of the barium titanyl oxalate. When the mixture's molar ratio(Ba/Ti) was within a range of 0.950-1.05, the formation of stoichiometric Barium titanate was confirmed with the help of barium tracers. The homogeneity of lanthanum deposite in the final product was also confirmed through the behavior of lanthanum tracers. The results as well as those obtained by XRD and SEM have been explained on the basis of the fact that the reaction occurs on the molecular level in solution and the barium titanate is formed in crystals of single phase.
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