Título

Formation of Nickel-Zinc Ferrite Embedded in a Silica Xerogel Matrix

Autor

SELINA REBECA DEL CARMEN PONCE CASTAÑEDA

SALVADOR ANTONIO PALOMARES SANCHEZ

JOSE ANDRES MATUTES AQUINO

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/about/cc0/

Materias

Sol-gel - (INFRARED SPECTROSCOPY) vibrating sample magnetometry - (X-RAY DIFFRACTION) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) FÍSICA - (CTI) OTRAS ESPECIALIDADES FÍSICAS - (CTI) OTRAS - (CTI)

Resumen o descripción

We report a study using X-ray diffraction, refinement Rietveld, IR absorption spectroscopy and vibrating sample magnetometry of the formation of particles of Ni-Zn ferrites embedded in a xerogel SiO2 matrix. Initial solutions were prepared mixing TEOS, distilled water, ethanol, and three different nitrates: iron, nickel and zinc. A molar ratio H2O:TEOS:Et-OH of 11.66:1.0:4.0 was used in all solutions. Formation of Ni0.5Zn0.5Fe2O4 as well as structural modifications of the SiO2 matrix induced by these particles are discussed. Ni-Zn crystals having dimensions varying from 4 to 16.5 nm have been synthesized by a suitable heat treatment schedule at temperatures varying from 700 to 1100◦C. The coercivity values for different heat-treated samples are found in the range 11–193 Oe, which are significantly larger than those presented by bulk Ni-Zn ferrites.

Fecha de publicación

2002

Tipo de publicación

Artículo

Versión de la publicación

Versión enviada

Recurso de información

http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1032

Formato

application/pdf

Idioma

Inglés

Repositorio Orígen

Fuente de Objetos Científicos Open Access

Descargas

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