LaFeO3 perovskite-type oxide prepared by oxide-mixing, co-precipitation and complex synthesis methods

The perovskite oxide, LaFeO3, was synthesized by three different preparatio n methods i.e., the calcination of a mixture of La2O3 and Fe2O3 (La-Fe-O), a co-precipitated precursor (La-Fe-OH), La(OH)(3) and Fe(OH)(3), and a hete ronuclear complex (La-Fe-CN), La[Fe(CN)(6)] . 5H(2)O. The obtained powders were characterized by thermogravimetric analysis, powder X-ray diffraction, electron microprobe analysis, specific surface area measurement and scanni ng electron microscopy. The formation of LaFeO3 is clearly recognized for L a-Fe-O, La-Fe-OH and La-Fe-CN at calcining temperatures above 1000, 800 and 600 degreesC, respectively. The mean particle diameter of La-Fe-CN calcine d at 600 degreesC for 2 hours was 30 nm. The LaFeO3 perovskite oxide powder obtained by the thermal decomposition of La-Fe-CN was most uniform on an a tomic level and the nanosized LaFeO3 powder was obtained at low temperature s. Furthermore, the sinterability was good. (C) 2001 Kluwer Academic Publis hers.