Please use this identifier to cite or link to this item: http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1032
Formation of Nickel-Zinc Ferrite Embedded in a Silica Xerogel Matrix
SELINA REBECA DEL CARMEN PONCE CASTAÑEDA
SALVADOR ANTONIO PALOMARES SANCHEZ
JOSE ANDRES MATUTES AQUINO
Acceso Abierto
Sin Derechos Reservados
Sol-gel
vibrating sample magnetometry
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.
2002
Artículo
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