Jiao Qingze

Synthetic studies of nanocrystalline composite oxides with the perovskite structure based on LaFeO3

Abstract The precursors for synthesis of nanocrystalline composite oxides La1−xSrxFe1−yCoyO3 (x = 0.2, 0.4; y = 0.5, 0.6) were prepared using the polyethylene glycol and citrate methods. After the solid-phase reaction at 550°C for 2 h, the mean diameters of the nanocrystalline grains were about 15 nm. The results indicate that the effects of the solid-phase reaction depend on the distribution of various components in the precursor and the conditions of preparing them. The polyethylene glycol method is superior in many respects to the citrate method.