Actas de congresos
Structural, Magnetic, And Mössbauer Characterization Of Size-controlled Iron-iron Oxide Nanoparticles Obtained By Chemical Methods
Registro en:
Ieee Transactions On Magnetics. , v. 39, n. 5 II, p. 2681 - 2683, 2003.
189464
10.1109/TMAG.2003.815556
2-s2.0-0141988482
Autor
Vargas J.M.
Socolovsky L.M.
Goya G.F.
Knobel M.
Zanchet D.
Institución
Resumen
Size-controlled Fe nanoparticles have been obtained by thermal decomposition of Fe(CO)5 in organic solution, in the presence of ligand molecules. Samples with different sizes, in the 6-12 nm range have been characterized by high-resolution transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, and magnetization measurements. All samples present narrow size distributions and superparamagnetic behavior. The exposition to air leads to the formation of a polycrystalline phase, mainly Fe3O4. 39 5 II 2681 2683 Denardin, J.C., Pakhomov, A.B., Brandl, A.L., Socolovsky, L.M., Knobel, M., Krishnan, K.M., Zhang, X.X., Study of magnetic state of granular magnetic alloy with magnetization extraordinary Hall effect and giant magnetoresistance (2003) Appl. Phys. Lett., 82, p. 763 Murray, C.B., Kagan, C.R., Bawendi, M.G., Synthesis and characterization of monodisperse nanocrystals and close-packed nanocrystal assemblies (2000) Annu. Rev. Mater. Sci., 30, p. 545 Wonterghem, J.V., Mørup, S., Charles, S.W., Wells, S., An investigation of the chemical reactions leading to the formation of ultrafine amourphous FE100-xCx Alloy particles (1988) J. Colloid Interface Sci., 121, p. 545 Vanderberghe, R.E., Degrave, E., De Bakker, P.M.A., On the methodology of the analysis of Mössbauer-spectra (1994) Hyp. Int., 83, p. 29 Greenwood, N.N., Earnshaw, A., (1984) Chemistry of the Elements, pp. 1254-1255. , Oxford, U.K.: Pergamon Rockenberger, J., Sher, E.C., Alivisatos, A.P., A new nonhydrolytic single-precursor approach to surfactant-capped nanocrystals of transition metal oxides (1999) J. Amer. Chem. Soc., 121, p. 11595 Hyeon, T., Lee, S.S., Park, J., Chung, Y., Na, H.B., Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process (2001) J. Amer. Chem. Soc., 123, p. 12798 Bentzon, M.D., Wonterghem, J.V., Mørup, S., Thölén, A., Koch, C.J.W., Ordered aggregates of ultrafine iron oxide particles: 'Super crystals' (1989) Phil. Mag. B, 60, p. 169 Theil Kuhn, L., Bojesen, A., Timermann, L., Meedom Nielsen, M., Mørup, S., Structural and magnetic properties of core-shell iron-iron oxide nanoparticles (2002) J. Phys.: Condens. Mater, 14, p. 13551