Abstract
α-Fe2O3 nanoparticles were synthesized by a low temperature solution combustion method. The structural, magnetic and luminescence properties were studied. Powder X-ray diffraction (PXRD) pattern of α-Fe2O3 exhibits pure rhombohedral structure. SEM micrographs reveal the dumbbell shaped particles. The EPR spectrum shows an intense resonance signal at g≈5.61 corresponding to isolated Fe3+ ions situated in axially distorted sites, whereas the g≈2.30 is due to Fe3+ ions coupled by exchange interaction. Raman studies show A1g (225cm−1) and Eg (293 and 409cm−1) phonon modes. The absorption at 300nm results from the ligand to metal charge transfer transitions whereas the 540nm peak is mainly due to the 6A1+6A1→4T1(4G)+4T1(4G) excitation of an Fe3+–Fe3+ pair. A prominent TL glow peak was observed at 140°C at heating rate of 5°Cs−1. The trapping parameters namely activation energy (E), frequency factor (s) and order of kinetics (b) were evaluated and discussed.
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