Natural magnetite nanoparticles from an iron-ore deposit: size dependence on magnetic properties
Por:
Rivas-Sanchez, ML, Alva-Valdivia, LM, Arenas-Alatorre, J, Urrutia-Fucugauchi, J, Perrin, M, Goguitchaichvili, A, Ruiz-Sandoval, M, Molina, MAR
Publicada:
1 ene 2009
Resumen:
We report oil the discovery of magnetite nanoparticles ranging in size from 2 to 14 full in the mineralized zones of the Pena Colorada iron-ore deposit, southern Mexico. Micrometric scale magnetite was magnetically reduced and divided into distinct size ranges: 85-56 mu m, 56-30 mu m, 30-22 mu m, 22-15 mu m, 15-10 mu m, 10-7 mu m and 7-2 mu m. Nanometric-scale magnetite in the size range 2-14 nm was identified. The magnetite was characterized by X-ray diffraction, transmitted and reflected light microscope, high-resolution transmission electron microscopy (TEM), high angle annular dark field, Mossbauer spectroscopy and its magnetic properties. Crystallographic identification of nanostructures Was performed using high-resolution TEM. Characteristic changes were observed when the particles make the size transition from micro- to nanometric sizes, as follows: (1) frequency-dependent magnetic Susceptibility percentage (chi FD%) measurements Show high Values (13%) for the 2-14 nm fractions
Filiaciones:
Rivas-Sanchez, ML:
Univ Nacl Autonoma Mexico, Lab Paleomagnetismo, Inst Geofis, Mexico City 04510, DF, Mexico
Alva-Valdivia, LM:
Univ Nacl Autonoma Mexico, Lab Paleomagnetismo, Inst Geofis, Mexico City 04510, DF, Mexico
Univ Nacl Autonoma Mexico, Lab Interinst Magnetismo Nat, Inst Geofis, Campus Morelia, Mexico
Arenas-Alatorre, J:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Urrutia-Fucugauchi, J:
Univ Nacl Autonoma Mexico, Lab Paleomagnetismo, Inst Geofis, Mexico City 04510, DF, Mexico
Goguitchaichvili, A:
Univ Nacl Autonoma Mexico, Lab Interinst Magnetismo Nat, Inst Geofis, Campus Morelia, Mexico
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