Artículo
Synthesis of Fe/SiO2 and iron oxides/SiO2 nanocomposites by long-term ball milling
Pozo Lopez, Gabriela del Valle
; Condo, Adriana Maria
; Urreta, Silvia Elena; Silvetti, Silvia Patricia de Guadalupe
Fecha de publicación:
01/2014
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
Materials Research Bulletin
ISSN:
0025-5408
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Iron oxide/SiO2 nanocomposites are synthesized by dry ball-milling a mixture of bcc Fe and α-quartz powders for prolonged times. A sequence of nanocomposites is obtained, with small magnetic particles dispersed in a non magnetic, amorphous matrix. The powders are characterized by X-ray diffraction and transmission electron microscopy. The magnetic hysteresis properties are investigated in the range 50-300 K. After 120 h milling, deformed, non-spherical, α-Fe nanocrystallites of about 10 nm in size and very few small (<10 nm) maghemite particles are found. At room temperature, iron particles are ferromagnetic and a large effective magnetic anisotropy is estimated, which is mainly attributed to surface effects. Between 160 and 200 h milling, maghemite nanoparticles are observed while after 220 h grinding, hematite phase appears; after 340 h milling, the sample consists of ferromagnetic hematite particles with a broad size distribution (5-50 nm) embedded in an amorphous matrix.
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Pozo Lopez, Gabriela del Valle; Condo, Adriana Maria; Urreta, Silvia Elena; Silvetti, Silvia Patricia de Guadalupe; Synthesis of Fe/SiO2 and iron oxides/SiO2 nanocomposites by long-term ball milling; Pergamon-Elsevier Science Ltd; Materials Research Bulletin; 49; 1; 1-2014; 237-244
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