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Mössbauer studies on ultraporous Fe-Oxide/SiO2 aerogel |
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| Authors: | A. Lančok K. Závěta M. Popovici C. Savii M. Gich A. Roig E. Molins K. Barčová |
| Affiliation: | (1) Joint Laboratory of Low Temperatures, V Holešovičkách 2, 180 00 Prague, Czech Republic;(2) Institute of Chemistry Timisoara of Romanian Academy, 24 Mihai Viteazul Blvd., 300223 Bucharest, Romania;(3) Institut de Ciència de Materials de Barcelona (CSIC), Esfera UAB, 08193, Bellaterra, Catalonia, Spain;(4) Institute of Physics, Technical University of Ostrava, 17. listopadu 15, 70833 Ostrava, Czech Republic |
| Abstract: | Magnetic aerogels with very low volume density of ～0.2 g/cm3 were prepared by sol-gel method and supercritical drying. The resulting materials were monolithic and displayed high surface area. By X-ray diffraction and Mössbauer spectroscopy the crystalline phase formed inside the mesopores of the SiO2 matrix was identified as a spinel iron oxide. Comparison of the magnetic measurements with Mössbauer spectra at various temperatures contributed to the elucidation of the magnetic state of this nanocomposite system with restricted magnetic interactions, in particular its transition to a superparamagnetic state. |
| Keywords: | aerogels Fe2O3 nanoparticles superparamagnetic state M?ssbauer spectroscopy |
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