SYNTHESIS OF NANOCRYSTALLINE COMPOSITE OXIDES LA1-XSRXFE1-YCOYO3 WITH THE PEROVSKITE STRUCTURE USING POLYETHYLENE GLYCOL-GEL METHOD

Precursors to La1-xSrxFe1-yCoyO3 have been prepared using polyethylene glycol as a protecting agent of colloidal particles via the sol-gel process. After the solid phase reaction at 500-600-degrees-C for 2 h, nanocrystalline composite oxides La1-xSrxFe1-yCoyO3 (x = 0.0, 0. 1, 0.2, 0.4; y = 0.1, 0.2, 0.5, 0.6. 1.0) were obtained. The effects of various conditions of the synthesis processes on the products containing the various components and the preparation processes of nanocrystalline composite oxides by the direct heat decomposition method are reported. The results indicate that the solid phase reaction can be completed at a lower temperature and with a shorter reaction time. and that it has a direct relationship to the distribution of the various components in the precursors.