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Autori: R. BOSÎNCEANU, F. IACOMI*, A. V. SANDU
Editorial: vol. 13, No. 9, p. p. 1095 –, 2011.
Fe3O4/γ-Fe2O3 modified single crystals zeolite LTA and natural clinoptilolite by treatment with urea/FeCl3 aqueous solutions under different experimental conditions were achieved. Our research involves a modified co-precipitation approach for the controlled growth of Fe3O4/γ-Fe2O3 nanocrystals within the superparamagnetic and single domains limits by creating the precipitating conditions with the help of the hydrolysis reaction of the urea. The resulting materials were investigated by powder- XRD, magnetic and the electrical resistance measurements. Room-temperature M-H measurements verify the influence of synthesis conditions and crystal size on the magnetic properties of ferrite nanocrystals. The structure of clinoptilolite (CLI) and Linde Type A (LTA) zeolites with channels and cages of dimensions at the molecular level was found to play the role of a template, controlling the size and distribution of the formed Fe3O4/γ-Fe2O3 nanoparticles
Cuvinte cheie: ferromagnetism, Linde Type A (LTA), Clinoptilolite (CLI), Urea, FexOy, Nanoparticles