SYNTHETIC STUDY OF NANOCRYSTALLINE COMPLEX OXIDES LAFE1-YCOYO3

A precursor to LaFe1-yCoyO3 has been prepared using the polyethylene g lycol-gel method. After calcination of the precursor at 450-550-degree s-C for 1-2 h, nanocrystalline complex oxides LaFe1-yCoyO3 (y = 0.5, 0 .6, 0.8) with the perovskite structure and grain diameter < ca. 10 nm were obtained; the materials were single phase and of good crystallini ty. The citric acid and self-propagating synthesis methods also gave n anocrystalline materials. The results indicate that the distribution o f the various components in the precursor has an important effect on t he subsequent solid-state reaction.