Nanopowders of La 2 Ti 2 O 7 have been successfully prepared by metallorganic decomposition method (MOD). In comparison with the higher reaction temperature of conventional preparation methods, such as solidstate reac tion (about 1100 C), the nanocrystal La 2 Ti 2 O 7 phase can be formed at an evidently lower temperature of 700 C by MOD. The resulting powders exhibit small and uniform grains. The imagines of FTIR show that acetylace tone can associate with La 3{ to form Laacetylacetone chelate complexes, and the absorption peak of La 3{ in precursor solution disappears, while the peaks of chelate complexes located at 1580 and 1420 cm |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 parti cles probably make it possible to form La 2 Ti 2 O 7 nanocrystal at significantly lower preparation temperature.[ 2),3) The synthesis of La 2 Ti 2 O 7 has been reported using solidstate reaction (SSR), polymerized complex, sol gel, coprecipitation and hydrothermal synthesis methods.
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