Abstract
The evolution of structural and magnetic properties of Zn0.5Ni0.5Fe2O4/SiO2 nanocomposites with the ferrite content embedded in the SiO2 matrix and the annealing temperature was investigated. The results showed the increase of crystallite size (2.7–57.4 nm), saturation magnetization (0.36–82.4 emu/g), remanence magnetization (0.06–15.4 emu/g) and the decrease of specific pore volume (0.183–0.010 cm3/g) and specific surface area (≤0.5–247 m2/g) with the increase of Zn0.5Ni0.5Fe2O4 content embedded in the SiO2 matrix and the annealing temperature. The SiO2 matrix exhibits diamagnetic behavior with a small ferromagnetic fraction, Zn0.5Ni0.5Fe2O4 embedded in SiO2 matrix presents superparamagnetic-like behavior, while bulk Zn0.5Ni0.5Fe2O4 a high-quality ferromagnetic type behavior.
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