Structural And Magnetic Characterization Of Single-Phase Ni0.5Zn0.5Fe2O4 Nanoparticles Dispersed In SiO2 Matrix Synthesized By Sol-Gel Processing

G. POZO LÓPEZ; A. M. CONDÓ; S. P. SILVETTI; M. DEL C. AGUIRRE; S. E. URRETA

Congreso; 11th Inter-American Congress on Microscopy; 2011

NiZn ferrites are versatile and technologically important magnetic materials, combining chemicalstability with a high-Curie temperature, low magnetic coercivity, high resistivity values, and littleeddy current loss in high frequency operations. Ferrite properties are known to be stronglyinfluenced by composition, microstructure, and so by the synthesis methodology. Various processing routes to obtain nanoscale ferrites are reported in the literature such as mechanical alloying, sol-gel, co-precipitation, hydrothermal, combustion and citrate methods. The sol-gel technique is widely preferred, as large quantities of final product, with very pure and homogeneous nanostructures, are obtained at a low cost. Nevertheless, in preparing sol-gel derived NiZn ferrite/SiO2 nanocomposites some difficulties, as the appearance of different phases apart from the single ferrite spinel phase, remain unsolved. In this work, we focus on the synthesis of NiZn ferrite/silica (Ni0.5Zn0.5Fe2O4)x/(SiO2)1-x (x= 5, 20 and 50 wt.%) nanocomposites by a sol-gel process.