Fe3O4 inverse spinal super paramagnetic nanoparticles |
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Authors: | Obaid ur RahmanSubash Chandra Mohapatra Sharif Ahmad |
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Affiliation: | Materials Research Lab, Department Of Chemistry, Jamia Millia Islamia, New Delhi 110025, India |
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Abstract: | The present article reports an energy efficient method for the synthesis of superparamagnetic ferrite (Fe3O4) nanoparticles (10-40 nm) and their annealing effect on the morphology, size, curie temperature and magnetic behavior at 50, 300, 400 and 500 °C. The synthesized nanoparticles were characterized by various spectroscopic techniques like FT-IR and UV-visible. The crystalline structure and particle size were estimated through solid phase as well as the liquid phase using XRD, TEM and DLS techniques. Superparamagnetic behavior of nanoparticles was confirmed by VSM. The EPR study reveals that the main feature of X-Band solid state EPR spectrum has strong transition at geff ∼ 3.23 (2100G) and a relatively weak transition at geff ∼ 2.05 (3300G). The later transition further confirms the super paramagnetic nature of these nano ferrites. The activation energy and order of weight losses of nano ferrites were found to be: 39.6 KJ mol−1 and 0.21 orders (600-800 °C), respectively, analyze with the help of TGA while the specific surface area (23.1 m2 g−1) and pore size (9 Å) were determined by Quanta chrome BET instrument. |
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Keywords: | Ferrite nanoparticles Superparamagnetism VSM and EPR |
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