Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/21586
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Campo DC | Valor | Lengua/Idioma |
---|---|---|
dc.contributor.author | Varanda, L. C. | - |
dc.contributor.author | Jafelicci Jr., M. | - |
dc.contributor.author | Tartaj, Pedro | - |
dc.contributor.author | O’ Grady, K. | - |
dc.contributor.author | González Carreño, T. | - |
dc.contributor.author | Morales, M. P. | - |
dc.contributor.author | Muñoz, T. | - |
dc.contributor.author | Serna Pereda, Carlos J. | - |
dc.date.accessioned | 2010-02-24T13:59:41Z | - |
dc.date.available | 2010-02-24T13:59:41Z | - |
dc.date.issued | 2002-08-15 | - |
dc.identifier.citation | Journal of Applied Physics 92(4): 2079 (2002) | en_US |
dc.identifier.issn | 0021-8979 | - |
dc.identifier.uri | http://hdl.handle.net/10261/21586 | - |
dc.description | 7 pages, 2 tables, 9 figures.-- PACS: 81.20.Ev; 81.05.Bx; 75.50.Tt; 82.30.Lp; 75.30.Cr; 75.60.Ej | en_US |
dc.description.abstract | Uniform metal iron ellipsoidal particles of around 200 nm in length were obtained by reduction and passivation of alumina-coated –Fe2O3 (hematite) particles under different conditions of temperature and hydrogen flow rate. The monodispersed hematite particles were prepared by the controlled hydrolysis of ferric sulfate and further coated with a homogeneous thin layer of Al2O3 by careful selection of the experimental conditions, mainly pH and aluminum salt concentration. The reduction mechanism of –Fe2O3 into –Fe was followed by x-ray and electron diffraction, and also by the measurements of the irreversible magnetic susceptibility. The transformation was found to be topotactic with the [001] direction of hematite particles, which lies along the long axis of the particles, becoming the [111] direction of magnetite and finally the [111] direction of metal iron. Temperature and hydrogen flow rate during the reduction have been found to be important parameters, which determine not only the degree of reduction but also the crystallite size of the final particles. Magnetic characterization of the samples shows that the only parameters affected by the crystallite size are the saturation magnetization and magnetic time-dependence effect, i.e., activation volume. | en_US |
dc.description.sponsorship | This work was supported by the CICYT under Project No. PB98-0525. Also, Dr. M.P. Morales, L.C. Varanda, and P. Tartaj gratefully acknowledge the Domingo Martinez Foundation, the Brazilian agency FAPESP, and the Royal Society, respectively, for financial support. | en_US |
dc.format.extent | 510383 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | en_US |
dc.publisher | American Institute of Physics | en_US |
dc.rights | openAccess | en_US |
dc.subject | Iron compounds | en_US |
dc.subject | Particle size | en_US |
dc.subject | Reduction (chemical) | en_US |
dc.subject | Magnetic particles | en_US |
dc.subject | X-ray diffraction | en_US |
dc.subject | Electron diffraction | en_US |
dc.title | Structural and magnetic transformation of monodispersed iron oxide particles in a reducing atmosphere | en_US |
dc.type | artículo | en_US |
dc.identifier.doi | 10.1063/1.1496124 | - |
dc.description.peerreviewed | Peer reviewed | en_US |
dc.relation.publisherversion | http://dx.doi.org/10.1063/1.1496124 | en_US |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.openairetype | artículo | - |
item.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
Aparece en las colecciones: | (ICMM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
magnetic transformation.pdf | 498,42 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
65
checked on 24-abr-2024
WEB OF SCIENCETM
Citations
62
checked on 28-feb-2024
Page view(s)
326
checked on 23-abr-2024
Download(s)
341
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.