Abstract:
The capacity of goethite for CdII substitution has been explored in a series of synthetic samples prepared from FeIII and CdII nitrate solutions aged 21 days in alkaline media. The total metal content ([Fe] + [Cd]) was 0.071 M in all preparations. The samples have been characterized by chemical and X-ray diffraction analysis; the morphology of the solids is described. The cell parameters for all samples were obtained by the Rietveld fits to the X-ray diffraction data. Refined structures show that for samples prepared at the final molar ratio μCd≤5.50 (expressed as μCd= 100×[Cd]/[Cd] + [Fe]), a (Cd, Fe)-goethite is the only crystalline product. In these samples, the unit cell parameters increased as a function of Cd concentration, indicating Cd incorporation in the structural frame. At the preparative ratio, μCd=7.03, the incorporation of Cd in the goethite structure is drastically reduced and a probable Cd-substituted hematite is formed together with the Fe,Cd-goethite. © 2003 International Centre for Diffraction Data.
Registro:
Documento: |
Artículo
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Título: | Structural study of a series of synthetic goethites obtained in aqueous solutions containing cadmium(II) ions |
Autor: | Sileo, E.E.; Solís, P.S.; Paiva-Santos, C.O. |
Filiación: | INQUIMAE, Ciudad Universitaria, Universidad de Buenos Aires, Piso 3, Buenos Aires, Argentina Instituto de Química, Universidade Estadual Paulista, UNESP, Araraquara, 14801-970 Sao Paulo, Brazil
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Palabras clave: | Cadmium; Rietveld analysis; Substituted goethite; Substituted hematite; X-ray powder diffraction; Rietveld analysis; Cadmium; Characterization; Crystalline materials; Nitrates; Solutions; X ray powder diffraction; Iron compounds |
Año: | 2003
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Volumen: | 18
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Número: | 1
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Página de inicio: | 50
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Página de fin: | 55
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DOI: |
http://dx.doi.org/10.1154/1.1538188 |
Título revista: | Powder Diffraction
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Título revista abreviado: | Powder Diffr.
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ISSN: | 08857156
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08857156_v18_n1_p50_Sileo |
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Citas:
---------- APA ----------
Sileo, E.E., Solís, P.S. & Paiva-Santos, C.O.
(2003)
. Structural study of a series of synthetic goethites obtained in aqueous solutions containing cadmium(II) ions. Powder Diffraction, 18(1), 50-55.
http://dx.doi.org/10.1154/1.1538188---------- CHICAGO ----------
Sileo, E.E., Solís, P.S., Paiva-Santos, C.O.
"Structural study of a series of synthetic goethites obtained in aqueous solutions containing cadmium(II) ions"
. Powder Diffraction 18, no. 1
(2003) : 50-55.
http://dx.doi.org/10.1154/1.1538188---------- MLA ----------
Sileo, E.E., Solís, P.S., Paiva-Santos, C.O.
"Structural study of a series of synthetic goethites obtained in aqueous solutions containing cadmium(II) ions"
. Powder Diffraction, vol. 18, no. 1, 2003, pp. 50-55.
http://dx.doi.org/10.1154/1.1538188---------- VANCOUVER ----------
Sileo, E.E., Solís, P.S., Paiva-Santos, C.O. Structural study of a series of synthetic goethites obtained in aqueous solutions containing cadmium(II) ions. Powder Diffr. 2003;18(1):50-55.
http://dx.doi.org/10.1154/1.1538188