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

Lachezar Radev | Zendy; Liliana Pavlova | Zendy; Bisserka Samuneva | Zendy; E. Kashchieva | Zendy; Irena Mihailova | Zendy; Maria Zaharescu | Zendy; Barbara Malič | Zendy; Luminița Predoană | Zendy

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

Author(s) -

Lachezar Radev,

Liliana Pavlova,

Bisserka Samuneva,

E. Kashchieva,

Irena Mihailova,

Maria Zaharescu,

Barbara Malič,

Luminița Predoană

Publication year - 2008

Publication title -

processing and application of ceramics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.326

H-Index - 15

eISSN - 2406-1034

pISSN - 1820-6131

DOI - 10.2298/pac0802103r

Subject(s) - materials science , crystallite , crystallization , nanomaterials , chemical engineering , sol gel , phase (matter) , morphology (biology) , catalysis , metal , nanotechnology , metallurgy , organic chemistry , chemistry , biology , engineering , genetics

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.

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