Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites

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dc.contributor.authorSileo, E. E.
dc.contributor.authorRodenas, L. G.
dc.contributor.authorPaiva-Santos, C. O.
dc.contributor.authorStephens, P. W.
dc.contributor.authorMorando, P. J.
dc.contributor.authorBlesa, M. A.
dc.contributor.institutionComis Nacl Energia Atom
dc.contributor.institutionUniv Buenos Aires
dc.contributor.institutionUniv Nacl San Martin
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSUNY Stony Brook
dc.contributor.institutionConsejo Nacl Invest Cient & Tecn
dc.date.accessioned2014-05-20T15:20:27Z
dc.date.available2014-05-20T15:20:27Z
dc.date.issued2006-07-01
dc.description.abstractA series of powdered cobalt ferrites, CoxFe3-xO4 with 0.66 <= x< 1.00 containing different amounts of Fe-II, were synthesized by a mild procedure, and their Fe and Co site occupancies and structural characteristics were explored using X-ray anomalous scattering and the Rietveld refinement method. The dissolution kinetics, measured in 0.1 M oxalic acid aqueous solution at 70 degrees C, indicate in all cases the operation of a contracting volume rate law. The specific rates increased with the Fell content following approximately a second-order polynomial expression. This result suggests that the transfer of Fe-III controls the dissolution rate, and that the leaching of a first layer of ions Co-II and Fe-II leaves exposed a surface enriched in slower dissolving octahedral Fe-III ions. Within this model, inner vicinal lattice Fe-II accelerates the rate of Fe-III transfer via internal electron hopping. A chain mechanism, involving successive electron transfers, fits the data very well. (C) 2006 Elsevier B.V. All rights reserved.en
dc.description.affiliationComis Nacl Energia Atom, Ctr Atom Constituyentes, Unidad Act Quim, RA-1650 Buenos Aires, DF, Argentina
dc.description.affiliationUniv Buenos Aires, Fac Ciências Exactas & Nat, Dept Quim Inorgan Analit & Quim Fis, INQUIMAE, RA-1428 Buenos Aires, DF, Argentina
dc.description.affiliationUniv Nacl San Martin, Inst Tecnol J Sabato, RA-1650 Buenos Aires, DF, Argentina
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Quim, BR-14801970 São Paulo, Brazil
dc.description.affiliationSUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
dc.description.affiliationConsejo Nacl Invest Cient & Tecn, Natl Res Council Argentine, RA-1033 Buenos Aires, DF, Argentina
dc.description.affiliationUniv Nacl San Martin, Escuela Posgrado, RA-1650 Buenos Aires, DF, Argentina
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Quim, BR-14801970 São Paulo, Brazil
dc.format.extent2237-2244
dc.identifierhttp://dx.doi.org/10.1016/j.jssc.2006.03.041
dc.identifier.citationJournal of Solid State Chemistry. San Diego: Academic Press Inc. Elsevier B.V., v. 179, n. 7, p. 2237-2244, 2006.
dc.identifier.doi10.1016/j.jssc.2006.03.041
dc.identifier.issn0022-4596
dc.identifier.urihttp://hdl.handle.net/11449/31744
dc.identifier.wosWOS:000238633700039
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Solid State Chemistry
dc.relation.ispartofjcr2.179
dc.relation.ispartofsjr0,632
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectcobalt ferritespt
dc.subjectX-ray anomalous scatteringpt
dc.subjectRietveld methodpt
dc.subjectkinetic dissolutionpt
dc.subjectelectron hoppingpt
dc.titleCorrelation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferritesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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