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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=fr>Natural magnetite nanoparticles from an iron-ore deposit: size dependence on magnetic properties</title>
<creator>Rivas-Sanchez, M. L.</creator>
<creator>Alva-Valdivia, L. M.</creator>
<creator>Arenas-Alatorre, J.</creator>
<creator>Urrutia-Fucugauchi, J.</creator>
<creator>Perrin, Mireille</creator>
<creator>Goguitchaichvili, A.</creator>
<creator>Ruiz-Sandoval, M.</creator>
<creator>Molina, M. A. R.</creator>
<contributor>Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México ; Université du Québec</contributor>
<contributor>Instituto de Física, Universidad Nacional Autónoma de México ; Université du Québec</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofisica, Sede Michoacan, Universidad Nacional Autonoma de Mexico ; Université du Québec</contributor>
<contributor>Dirección General y Dirección de Tecnología, Consorcio Minero Benito Juárez ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 1343-8832</source>
<source>Earth Planets and Space</source>
<publisher>Springer/Terra Scientific Publishing Company</publisher>
<identifier>hal-00413053</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00413053</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00413053</source>
<source>Earth Planets and Space, Springer/Terra Scientific Publishing Company, 2009, 61 (1), pp.151-160</source>
<language>en</language>
<subject lang=it>Magnetite nanoparticles</subject>
<subject lang=it>berthierine</subject>
<subject lang=it>particle size</subject>
<subject lang=it>magnetic properties</subject>
<subject lang=it>iron-ore deposit</subject>
<subject lang=it>Peña Colorada</subject>
<subject lang=it>Mexico</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>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 attributed to dominant fractions of superparamagnetic particles; (2) variations of chi FD% < 4.5% in fractions of 56-0.2 mu m occur in association with the presence of microparticles formed by magnetite aggregates of nanoparticles (< 15 nm) embedded in berthierine; (3) Mossbauer spectroscopy results identified a superparamagnetic fraction; (4) nanometric and 0.2-3 mu m grain size magnetite particles require a magnetic field up to 152 mT to reach saturation during the isothermal remanent magnetization experiment; (5) coercivity and remanent magnetization of the magnetite increase when the particle size decreases, probably due to parallel Coupling effects; (6) two-magnetic Susceptibility versus temperature experiments of the same 2-14 nm sample show that the reversibility during the second heating is due to the formation of new magnetite nanoparticles and growth of those already present. during the first heating process.</description>
<date>2009</date>
</dc>
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