Surface segregation in SnO2-Fe2O3 nanopowders and effects in mössbauer spectroscopy

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dc.contributor.authorCASTRO, R. H. R.
dc.contributor.authorHIDALGO, P.
dc.contributor.authorCOAQUIRA, J. A. H.
dc.contributor.authorBETTINI, J.
dc.contributor.authorZANCHET, D.
dc.contributor.authorGOUVEA, D.
dc.date.accessioned2022-01-12T22:05:50Z
dc.date.available2022-01-12T22:05:50Z
dc.date.issued2005-06-01
dc.description.abstractSnO2-Fe2O3 nanopowders prepared by the polymeric precursor method were studied by combined conventional and high-resolution techniques. The powders treated at 500°C were analyzed by EDS local probe associated with HRTEM to directly detect surface segregation of Fe ions onto SnO2 nanoparticles over a broad range of concentrations. The segregation of these ions controls the system microstructure by changing the surface energies and acting as nucleation sites for the formation of a Fe oxide phase (magnetite) at high Fe concentrations. A technologically interesting core-shell-type particle structure, with a magnetic shell and semiconductor core, was observed for the first time. The influence of the segregated Fe ions in Mössbauer spectra is also addressed as a new proposal for the interpretation of the effects of composition changes in both the bulk and at the interface of particles. In this proposal, the two observed sites in Mössbauer spectra would be independently related to bulk-substituted and surface-segregated Fe ions. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.
dc.description.firstpage2134
dc.description.issuenumber11
dc.description.lastpage2138
dc.identifier.citationCASTRO, R. H. R.; HIDALGO, P.; COAQUIRA, J. A. H.; BETTINI, J.; ZANCHET, D. Surface segregation in SnO2-Fe2O3 nanopowders and effects in mössbauer spectroscopy. European Journal of Inorganic Chemistry, n.11, p. 2134-2138, June, 2005.
dc.identifier.doi10.1002/ejic.200400879
dc.identifier.issn1434-1948
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/4367
dc.relation.ispartofEuropean Journal of Inorganic Chemistry
dc.rightsAcesso Restrito
dc.subject.otherlanguageElectron microscopy
dc.subject.otherlanguageMaterials science
dc.subject.otherlanguageMoessbauer spectroscopy
dc.subject.otherlanguageNanostructures
dc.subject.otherlanguageSemiconductors
dc.titleSurface segregation in SnO2-Fe2O3 nanopowders and effects in mössbauer spectroscopy
dc.typeArtigo
fei.scopus.citations52
fei.scopus.eid2-s2.0-20444458788
fei.scopus.updated2024-12-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=20444458788&origin=inward
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