Morphological, structural and magnetic properties of alpha-Fe2O3 nanoparticles in an amorphous alumina matrix obtained by aqueous combustion method

作者：Tadic Marin^*; Kusigerski Vladan; Markovic Dragana; Citakovic Nada; Remskar Maja; Spasojevic Vojislav

来源：Journal of Alloys and Compounds, 2009, 486(1-2): 839-843.

DOI：10.1016/j.jallcom.2009.07.077

• Nanostructured materials
• Composite materials
• Oxide materials
• Magnetic measurements
• Transmission electron microscopy (TEM)

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.

• 出版日期2009-11-3