Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites
dc.contributor.author | Sileo, E. E. | |
dc.contributor.author | Rodenas, L. G. | |
dc.contributor.author | Paiva-Santos, C. O. | |
dc.contributor.author | Stephens, P. W. | |
dc.contributor.author | Morando, P. J. | |
dc.contributor.author | Blesa, M. A. | |
dc.contributor.institution | Comis Nacl Energia Atom | |
dc.contributor.institution | Univ Buenos Aires | |
dc.contributor.institution | Univ Nacl San Martin | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | SUNY Stony Brook | |
dc.contributor.institution | Consejo Nacl Invest Cient & Tecn | |
dc.date.accessioned | 2014-05-20T15:20:27Z | |
dc.date.available | 2014-05-20T15:20:27Z | |
dc.date.issued | 2006-07-01 | |
dc.description.abstract | A 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.affiliation | Comis Nacl Energia Atom, Ctr Atom Constituyentes, Unidad Act Quim, RA-1650 Buenos Aires, DF, Argentina | |
dc.description.affiliation | Univ Buenos Aires, Fac Ciências Exactas & Nat, Dept Quim Inorgan Analit & Quim Fis, INQUIMAE, RA-1428 Buenos Aires, DF, Argentina | |
dc.description.affiliation | Univ Nacl San Martin, Inst Tecnol J Sabato, RA-1650 Buenos Aires, DF, Argentina | |
dc.description.affiliation | Univ Estadual Paulista, UNESP, Inst Quim, BR-14801970 São Paulo, Brazil | |
dc.description.affiliation | SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA | |
dc.description.affiliation | Consejo Nacl Invest Cient & Tecn, Natl Res Council Argentine, RA-1033 Buenos Aires, DF, Argentina | |
dc.description.affiliation | Univ Nacl San Martin, Escuela Posgrado, RA-1650 Buenos Aires, DF, Argentina | |
dc.description.affiliationUnesp | Univ Estadual Paulista, UNESP, Inst Quim, BR-14801970 São Paulo, Brazil | |
dc.format.extent | 2237-2244 | |
dc.identifier | http://dx.doi.org/10.1016/j.jssc.2006.03.041 | |
dc.identifier.citation | Journal of Solid State Chemistry. San Diego: Academic Press Inc. Elsevier B.V., v. 179, n. 7, p. 2237-2244, 2006. | |
dc.identifier.doi | 10.1016/j.jssc.2006.03.041 | |
dc.identifier.issn | 0022-4596 | |
dc.identifier.uri | http://hdl.handle.net/11449/31744 | |
dc.identifier.wos | WOS:000238633700039 | |
dc.language.iso | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation.ispartof | Journal of Solid State Chemistry | |
dc.relation.ispartofjcr | 2.179 | |
dc.relation.ispartofsjr | 0,632 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | cobalt ferrites | pt |
dc.subject | X-ray anomalous scattering | pt |
dc.subject | Rietveld method | pt |
dc.subject | kinetic dissolution | pt |
dc.subject | electron hopping | pt |
dc.title | Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites | en |
dc.type | Artigo | |
dcterms.license | http://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy | |
dcterms.rightsHolder | Elsevier B.V. |
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