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

Autor:	Barbara Malič, Luminita Predoana, Liliana Pavlova, Irena Mihailova, Maria Zaharescu, Bisserka Samuneva, Lachezar Radev, E. Kashchieva
Rok vydání:	2008
Předmět:	Morphology (linguistics) Materials science Mineralogy law.invention Nanomaterials Catalysis Chemical engineering law Ceramics and Composites Chelation Crystallite Crystallization Chemical composition Sol-gel
Zdroj:	Processing and Application of Ceramics. 2:103-108
ISSN:	2406-1034 1820-6131
DOI:	10.2298/pac0802103r
Popis:	LaCoO3 powders are studied because they exhibit interesting electrical, magnetic and catalytic properties. In this paper, new synthesized La2O3-CoO-SiO2 powders with different quantity of silica were prepared via solgel 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 LaCoO3-SiO2 powders, depending on the content of SiO2 and the treatment temperature (700-1100?C), different crystalline phases (LaCoO3, Co2 SiO4 and La9.31 (SiO4 )6 O2) 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ccca0abdaefe10312dd565584f039fb3 https://doi.org/10.2298/pac0802103r Zobrazit plný text záznamu