Abstract
We report on morphological, structural and magnetic properties of α-Fe 2O 3 nanoparticles in an amorphous alumina matrix synthesized by aqueous combustion method. The sample was characterized by X-ray powder diffraction (XRPD), high-resolution electron microscopy (HREM) and SQUID magnetometry. XRPD study reveals the phase purity of α-Fe 2O 3 whereas HREM images show an unusual spongy structure and well-crystallized nanoparticles with a size of about 25 nm. Magnetic measurements show a high irreversibility temperature T irr ≈ 350 K, Morin transition at T M ≈ 210 K, increase of the magnetization below T ≈ 45 K and hysteretic behavior below T M at 5 K and 200 K.
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