The perovskite oxide LaCoO
3 was synthesized by three different preparative methods
i.e., the calcination of a mixture of La
2O
3 and CoO (La–Co–O) and pyrolysis of a co-precipitated precursor (La–Co–ox), La
2 (C
2O
4)
3 ·
xH
2O + CoC
2O
4 ·
yH
2O, and a heteronuclear complex (La–Co–CN), La[Co(CN)
6] · 5H
2O. The obtained powders were characterized by thermogravimetric analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and specific surface area measurements. The formation of LaCoO
3 single phase is clearly recognized for La–Co–O, La–Co–ox and La–Co–CN at temperatures above 1000, 1200 and 600 °C, respectively. The nano-sized LaCoO
3 powder was obtained at low temperatures by pyrolysis of La–Co–CN. The mean particle diameter of La–Co–CN calcined at 600 °C for 2 h was 72 nm.
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