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Cd-Substituted Goethites — A Structural Investigation by Synchrotron X-ray Diffraction

Published online by Cambridge University Press:  01 January 2024

Trang Huynh ,
Andrew R. Tong ,
Balwant Singh  and
Brendan J. Kennedy
Trang Huynh
Affiliation:
University of Agriculture and Forestry, Ho Chi Minh City, Vietnam Faculty of Agriculture, Food and Natural Resources, The University of Sydney, Sydney, NSW 2006, Australia
Andrew R. Tong
Affiliation:
Centre for Heavy Metal Research, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
Balwant Singh*
Affiliation:
Faculty of Agriculture, Food and Natural Resources, The University of Sydney, Sydney, NSW 2006, Australia
Brendan J. Kennedy
Affiliation:
Centre for Heavy Metal Research, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
*
*E-mail address of corresponding author: b.singh@acss.usyd.edu.au
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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.

Keywords

CadmiumCd SubstitutionFe OxidesGoethiteRietveld RefinementSynchrotron X-ray Diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 4 , August 2003 , pp. 397 - 402
Copyright
Copyright © 2003, The Clay Minerals Society

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