LA-NI-OXIDE FILMS, FIBERS AND POWDERS BY LA(MOE)(3)-NI(ACAC)(2) PRECURSORS

The preparation of LaNiO3, La4Ni3O10, La3Ni2O7-delta and La2NiO4 via L a-methoxy-ethanolato - Ni(acac)(2) precursor was investigated. Front t hese precursors films, fibers and powders were prepared and heat treat ed to form LaNiO3 at temperatures as low as 750 degrees C with a heati ng rime of 4 h. The formation of La-4 Ni-3 O-10 and La-2 NiO4 was comp lete at 1,000 degrees C, for 4 h, while monophasic La3Ni2O7 required h eating to 1,150 degrees C, for I h. Pathways yielding various phases w ere also discussed briefly The techniques used in this study are TGA, mass-spectroscopy, SEM-EDS, TEM-EDS, powder-XRD, and FT-IR spectroscop y.