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Sileo, E.E.; García Rodenas, L.; Paiva-Santos, C.O.; Stephens, P.W.; Morando, P.J.; Blesa, M.A. "Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites" (2006) Journal of Solid State Chemistry. 179(7):2237-2244
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Abstract:

A series of powdered cobalt ferrites, CoxFe3-xO4 with 0.66≤x<1.00 containing different amounts of FeII, 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 °C, indicate in all cases the operation of a contracting volume rate law. The specific rates increased with the FeII content following approximately a second-order polynomial expression. This result suggests that the transfer of FeIII controls the dissolution rate, and that the leaching of a first layer of ions CoII and FeII leaves exposed a surface enriched in slower dissolving octahedral FeIII ions. Within this model, inner vicinal lattice FeII accelerates the rate of FeIII transfer via internal electron hopping. A chain mechanism, involving successive electron transfers, fits the data very well. © 2006 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites
Autor:Sileo, E.E.; García Rodenas, L.; Paiva-Santos, C.O.; Stephens, P.W.; Morando, P.J.; Blesa, M.A.
Filiación:INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Pabellon II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Unidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Avenida General Paz 1499, 1650 San Martin, Prov. Buenos Aires, Argentina
Instituto de Tecnología J. Sábato, Universidad Nacional de San Martín, Avenida Gral. Paz 1499, 1650 San Martin, Prov. Buenos Aires, Argentina
Instituto de Química, Universidade Estadual Paulista, UNESP. Araraquara, 14801-970 São Paulo, Brazil
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, United States
National Research Council of Argentine (CONICET), Avenida Rivadavia 1917, C1033AAJ Buenos Aires, Argentina
Escuela de Posgrado, Universidad Nacional de San Martín, Peatonal Belgrano 3563 1er Piso, 1650 San Martin, Prov. Buenos Aires, Argentina
Palabras clave:Cobalt ferrites; Electron hopping; Kinetic dissolution; Rietveld method; X-ray anomalous scattering; Dissolution; Iron compounds; Molecular structure; Reaction kinetics; Substitution reactions; Synthesis (chemical); X ray scattering; Cobalt ferrites; Electron hopping; Kinetic dissolution; Rietveld method; X-ray anomalous scattering; Cobalt compounds
Año:2006
Volumen:179
Número:7
Página de inicio:2237
Página de fin:2244
DOI: http://dx.doi.org/10.1016/j.jssc.2006.03.041
Título revista:Journal of Solid State Chemistry
Título revista abreviado:J. Solid State Chem.
ISSN:00224596
CODEN:JSSCB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00224596_v179_n7_p2237_Sileo

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Citas:

---------- APA ----------
Sileo, E.E., García Rodenas, L., Paiva-Santos, C.O., Stephens, P.W., Morando, P.J. & Blesa, M.A. (2006) . Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites. Journal of Solid State Chemistry, 179(7), 2237-2244.
http://dx.doi.org/10.1016/j.jssc.2006.03.041
---------- CHICAGO ----------
Sileo, E.E., García Rodenas, L., Paiva-Santos, C.O., Stephens, P.W., Morando, P.J., Blesa, M.A. "Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites" . Journal of Solid State Chemistry 179, no. 7 (2006) : 2237-2244.
http://dx.doi.org/10.1016/j.jssc.2006.03.041
---------- MLA ----------
Sileo, E.E., García Rodenas, L., Paiva-Santos, C.O., Stephens, P.W., Morando, P.J., Blesa, M.A. "Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites" . Journal of Solid State Chemistry, vol. 179, no. 7, 2006, pp. 2237-2244.
http://dx.doi.org/10.1016/j.jssc.2006.03.041
---------- VANCOUVER ----------
Sileo, E.E., García Rodenas, L., Paiva-Santos, C.O., Stephens, P.W., Morando, P.J., Blesa, M.A. Correlation of reactivity with structural factors in a series of Fe(II) substituted cobalt ferrites. J. Solid State Chem. 2006;179(7):2237-2244.
http://dx.doi.org/10.1016/j.jssc.2006.03.041