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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
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
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
Volumen:18
Número:1
Página de inicio:50
Página de fin:55
DOI: http://dx.doi.org/10.1154/1.1538188
Título revista:Powder Diffraction
Título revista abreviado:Powder Diffr.
ISSN:08857156
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