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Clays and Clay Minerals; August 2003; v. 51; no. 4; p. 397-402; DOI: 10.1346/CCMN.2003.0510405
© 2003 Clay Minerals Society
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Cd-SUBSTITUTED GOETHITES – A STRUCTURAL INVESTIGATION BY SYNCHROTRON X-RAY DIFFRACTION

Trang Huynh1,2, Andrew R. Tong3, Balwant Singh2,* and Brendan J. Kennedy3

1 University of Agriculture and Forestry, Ho Chi Minh City, Vietnam
2 Faculty of Agriculture, Food and Natural Resources, The University of Sydney, Sydney, NSW 2006, Australia
3 Centre for Heavy Metal Research, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia

* E-mail address of corresponding author: b.singh{at}acss.usyd.edu.au

The structural and physical effects of partially substituting Cd for Fe in goethite have been investigated. The solubility of Cd2+ in goethite is ~10 mol.%, i.e. Fe0.905Cd0.095OOH. The structures of the substituted goethites have been refined, using the Rietveld method, from synchrotron X-ray powder diffraction data. There is a progressive increase in the size of the unit-cell parameters and unit-cell volume, upon the incorporation of much larger Cd2+ ion (0.95 Å) compared with Fe3+ (0.645 Å) in the goethite structure, together with a reduction in crystallinity. Transmission electron microscopy measurements confirm the crystallite size decreases as the Cd2+ content increases in goethite structure.

Key Words: Cadmium • Cd Substitution • Fe Oxides • Goethite • Rietveld Refinement • Synchrotron X-ray Diffraction




This article has been cited by other articles:


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N. Kaur, M. Grafe, B. Singh, and B. Kennedy
SIMULTANEOUS INCORPORATION OF Cr, Zn, Cd, AND Pb IN THE GOETHITE STRUCTURE
Clays and Clay Minerals, April 1, 2009; 57(2): 234 - 250.
[Abstract] [Full Text] [PDF]

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M. A. Wells, R. W. Fitzpatrick, and R. J. Gilkes
THERMAL AND MINERAL PROPERTIES OF Al-, Cr-, Mn-, Ni- AND Ti-SUBSTITUTED GOETHITE
Clays and Clay Minerals, April 1, 2006; 54(2): 176 - 194.
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