有機金属化合物分解法によるLa_2Ti_2O_7ナノ結晶の低温合成(<特集>イノベーティブセラミックス(I))

概要

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Nanopowders of La_2Ti_2O_7 have been successfully prepared by metallorganic decomposition method (MOD). In comparison with the higher reaction temperature of conventional preparation methods, such as solid-state reaction (about 1100℃), the nanocrystal La_2Ti_2O_7 phase can be formed at an evidently lower temperature of 700℃ by MOD. The resulting powders exhibit small and uniform grains. The imagines of FT-IR show that acetylacetone can associate with La^<3+> to form La-acetylacetone chelate complexes, and the absorption peak of La^<3+> in precursor solution disappears, while the peaks of chelate complexes located at 1580 and 1420cm^<-1> are found correspondingly. The probable reason is that small precursor particles can be formed at a homogeneous and low La^<3+> concentration by control release from the complexes; these small, uniform and more active precursor particles probably make it possible to form La_2Ti_2O_7 nanocrystal at significantly lower preparation temperature.
2005-01-01