Título

Magnetic nanocomposites: preparation and characterization of Co-ferrite nanoparticles in a silica matrix

Autor

LUIS ALFONSO GARCIA CERDA

JOSE ANDRES MATUTES AQUINO

OSCAR EDUARDO AYALA VALENZUELA

Nivel de Acceso

Acceso Abierto

Resumen o descripción

Magnetic nanocomposites of Co-ferrite nanoparticles dispersed in silica matrix

(CoFe2O4/SiO2) have been prepared by the sol–gel technique using

tetraethylorthosilicate (TEOS) as precursor of silica, and metallic nitrates as precursors

of ferrite. Samples prepared in powder form have been dried at 100 °C for 3 h and

calcined for 2 h at temperatures between 500 and 1000 °C. Co-ferrite particles were

formed in the matrix pores and the nucleation of these particles was observed with the

increase in the calcining temperature. TEM measurements showed that the

nanoparticles had a fairly uniform morphology and an average particle size of

approximately 5 nm. The combination of different Co-ferrite concentrations and

calcining temperatures allowed to obtain samples with saturation magnetization ranging

from 0.7 to 21.8 emu/g.

Fecha de publicación

2004

Tipo de publicación

Artículo

Versión de la publicación

Versión enviada

Formato

application/pdf

Idioma

Inglés

Repositorio Orígen

Fuente de Objetos Científicos Open Access

Descargas

371

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