Abstract
Nanocomposite Fe x(SiO 2) 1-x samples were prepared using high energy ball milling. The microstructure and magnetic properties of these samples with different Fe contents and different ball milling time were studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy, and magnetic balance over a wide temperature range. The results indicated that the microstructure and magnetic properties were closely related to the ball milling time and Fe contents. When the Fe content was less than 20 wt%, the sample after ball milling 80 hours demonstrated a very complex microstructure. The small α-Fe grains and Fe clusters were implanted in the SiO 2 matrix, and there were also nanometer-scale sandwich network-like structures. The nanocomposite Fe x(SiO 2) 1-x samples also displayed the change of magnetic properties, which results from their unique nanostructure, the grain size effect, the strong interface interaction and the interface-osmosis effect at the Fe-SiO 2 boundaries.
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