Cd-substitued goethites – A structural investigation by synchrotron x-ray diffraction

Huynh, Trang, Tong, Andrew R., Singh, Balwant and Kennedy, Brendan J. (2003) Cd-substitued goethites – A structural investigation by synchrotron x-ray diffraction. Clays and Clay Minerals, 51 4: 397-402. doi:10.1346/CCMN.2003.0510405


Author Huynh, Trang
Tong, Andrew R.
Singh, Balwant
Kennedy, Brendan J.
Title Cd-substitued goethites – A structural investigation by synchrotron x-ray diffraction
Journal name Clays and Clay Minerals   Check publisher's open access policy
ISSN 0009-8604
1552-8367
Publication date 2003-08
Sub-type Article (original research)
DOI 10.1346/CCMN.2003.0510405
Volume 51
Issue 4
Start page 397
End page 402
Total pages 6
Place of publication Chantilly, Va, U.S.A.
Publisher Clay and Mineral Society
Language eng
Subject 0403 Geology
0503 Soil Sciences
Formatted abstract
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.
Keyword Cadmium
Cd Substitution
Fe Oxides
Goethite
Rietveld Refinement
Synchrotron X-ray Diffraction
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Excellence in Research Australia (ERA) - Collection
 
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Created: Thu, 22 Apr 2010, 10:38:24 EST by Ms May Balasaize on behalf of Sustainable Minerals Institute