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KMID : 1059519940380040309
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Journal of the Korean Chemical Society
1994 Volume.38 No. 4 p.309 ~ p.318
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Stable Defect Structure of La2O3-Modified BaTiO3
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Kim Jeong-Soo
Park Hyu-Bum
Ahn Tae-Ho
Kim Si-Joong
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Abstract
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The stable defect structure and the single phase region of La2O3-modified BaTiO3 have been studied by X-ray diffractometer and scanning electron microscope. The stable defect structure of La2O3-modified BaTiO3 has been identified as [(BaxBa)1-2x(La·Ba)x][TixTi)1-x/2(V""Ti)x/2]O3 which consists of La3+ ion substitution for Ba3+ ion in the lattice structure and the formation of Ti vacancies for the charge compensation. When 3 mol% of La2O3·3/2TiO3 was added to BaTiO3, the unit cell structure was transformed from tetragonal to cubic and the solubility limit was about 14 mol%. When La2O3·3/2TiO2 was added above this solubility limit, the second phase, La4Ba2Ti5O18, was formed. In the La2O3-modified BaTiO3, it was found by the liquid phase sintering process that the sinterability was decreased by excess BaO but increased by excess TiO2.
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