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LaCoO 3 powders are studied because they exhibit interesting electrical, magnetic and catalytic properties. In this paper, new synthesized La 2 O 3 -CoO-SiO 2 powders with different quantity of silica were prepared via sol- gel method in aqua media, starting from metal nitrates with different chelating agents. The relation between the reaction in solution, crystallization pathway and morphology were discussed. In LaCoO 3 -SiO 2 powders, depending on the content of SiO 2 and the treatment temperature (700-1100°C), different crystalline phases (LaCoO 3 , Co 2 SiO 4 and La 9.31 (SiO 4 ) 6 O 2 ) were observed with the crystallite sizes ranging from 50 to 100 nm. It was proved that chemical composition and nature of used additives has influence on the phase formation and structure of obtained nanomaterials.

Sol-gel synthesis and structure of La2O3-CoO-SiO2 powders