Influence of the genesis on the structural and hyperfine properties of Cr-substituted hematites
Several series of Cr-substituted hematites with Cr:Fe molar ratio up to 0.112 were prepared by forced hydrolysis of Fe3+ solutions and by thermal dehydroxylation of Cr substituted goethites. Powder X-ray diffraction was used in order to assess the structural characteristics of the whole series. Riet...
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2007
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| 008 | 190411s2007 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-33847054719 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Sileo, E.E. | |
| 245 | 1 | 0 | |a Influence of the genesis on the structural and hyperfine properties of Cr-substituted hematites |
| 260 | |c 2007 | ||
| 270 | 1 | 0 | |m Sileo, E.E.; INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Pabellon II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina; email: sileo@qi.fcen.uba.ar |
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| 506 | |2 openaire |e Política editorial | ||
| 520 | 3 | |a Several series of Cr-substituted hematites with Cr:Fe molar ratio up to 0.112 were prepared by forced hydrolysis of Fe3+ solutions and by thermal dehydroxylation of Cr substituted goethites. Powder X-ray diffraction was used in order to assess the structural characteristics of the whole series. Rietveld refinement of XRD data for samples obtained by forced hydrolysis indicated that the incorporation of Cr causes anisotropic changes in the a-lattice parameter and stacking faults. In hematite samples obtained from Cr-goethites, the cell-parameters decrease with the increase in Cr-content. In all cases, the particles were multidomainic, with sizes that varied between 0.13 ± 0.02 and 1.07 ± 0.05 μm. The Morin transition was detected in substituted samples with low Cr-content, but it was no longer present in samples containing μCr ≥ 4.3 ± 0.2 (μCr = 100 × [Cr] / [Cr] + [Fe] mol mol- 1). Mössbauer spectroscopy suggested that the AF phase of Cr-hematites obtained by forced hydrolysis of Fe(III) salts, did not present parallel spin alignment along the [111] direction. These solids presented an unusually low value for TM which was ascribed to the interplay of anisotropic lattice changes, small grain sizes, metal vacancy sites and structurally bound water. All samples presented spin orientation in the (111) basal plane in the WF phase. Néel temperature variation was also explained by the concomitant contributions coming from Cr-for-Fe substitution and anisotropic lattice variations. © 2006 Elsevier B.V. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Departamento Administrativo de Ciencia, Tecnología e Innovación, COLCIENCIAS | ||
| 536 | |a Detalles de la financiación: Secretaría de Ciencia y Técnica, Universidad de Buenos Aires, X800 | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: This work has been partially supported by UBACYT (X800) from Universidad de Buenos Aires and CONICET (Argentina). Financial support from COLCIENCIAS (Colombia) through the CIAM program is also acknowledged. The authors also acknowledge Cynthia Ramos for her help with the English grammar. | ||
| 593 | |a INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Pabellon II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina | ||
| 593 | |a Unidad de Actividad Física, Comisión Nacional de Energía Atómica, Avenida Gral. Paz 1499, 1650 San Martín, Argentina | ||
| 593 | |a Grupo de Estado Sólido, Instituto de Física, Universidad de Antioquía, A.A.1226, Medellin, Colombia | ||
| 690 | 1 | 0 | |a CR-SUBSTITUTED HEMATITES |
| 690 | 1 | 0 | |a MEAN COHERENCE PATH DIMENSIONS |
| 690 | 1 | 0 | |a MÖSSBAUER SPECTROSCOPY |
| 690 | 1 | 0 | |a RIETVELD REFINEMENT |
| 690 | 1 | 0 | |a CHROMIUM |
| 690 | 1 | 0 | |a GOETHITE |
| 690 | 1 | 0 | |a HEMATITE |
| 690 | 1 | 0 | |a MOSSBAUER SPECTROSCOPY |
| 690 | 1 | 0 | |a RIETVELD ANALYSIS |
| 690 | 1 | 0 | |a X-RAY DIFFRACTION |
| 700 | 1 | |a Daroca, D.P. | |
| 700 | 1 | |a Barrero, C.A. | |
| 700 | 1 | |a Larralde, A.L. | |
| 700 | 1 | |a Giberti, M.S. | |
| 700 | 1 | |a Saragovi, Celia | |
| 773 | 0 | |d 2007 |g v. 238 |h pp. 84-93 |k n. 1-2 |p Chem. Geol. |x 00092541 |w (AR-BaUEN)CENRE-4154 |t Chemical Geology | |
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