Morphological, structural and magnetic properties of alpha-Fe2O3 nanoparticles in an amorphous alumina matrix obtained by aqueous combustion method
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We report on morphological, structural and magnetic properties of alpha-Fe2O3 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 alpha-Fe2O3 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 approximate to 350 K, Morin transition at T-M approximate to 210 K, increase of the magnetization below T approximate to 45 K and hysteretic behavior below T-M at 5 K and 200 K. (C) 2009 Elsevier B.V. All rights reserved.
Keywords:Nanostructured materials / Composite materials / Oxide materials / Magnetic measurements / Transmission electron microscopy (TEM)
Source:Journal of Alloys and Compounds, 2009, 486, 1-2, 839-843
- The Serbian Ministry of Science