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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: [email protected]
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Abstract

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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

References

Cornell, R.M. and Giovanoli, R., (1988) The influence of copper on the transformation of ferrihydrite (5Fe2O3.9H2O) into crystalline products in alkaline media Polyhedron 7 385–391 10.1016/S0277-5387(00)80487-8.Google Scholar
Cornell, R.M. and Schwertmann, U., (1996) The Iron Oxides Germany VCH, Weinheim.Google Scholar
Deer, W.A. Howie, R.A. and Zussman, J., (1980) An Introduction to the Rock Forming Minerals London Longmans.Google Scholar
Fey, M.V. and Dixon, J.B., (1981) Synthesis and properties of poorly crystalline hydrated aluminous goethites Clays and Clay Minerals 29 91–100 10.1346/CCMN.1981.0290202.Google Scholar
Gerth, J., (1990) Unit-cell dimensions of pure and trace metal-associated goethites Geochimica et Cosmochimica Acta 54 363–371 10.1016/0016-7037(90)90325-F.Google Scholar
Hunter, B.A., (1997) Rietica for Windows 1.74 Australia ANSTO, Sydney.Google Scholar
Lidi, D., (1999) CRC Handbook of Chemistry and Physics 1998–1999 Florida CRC, Boca Raton.Google Scholar
Lim-Nunez, R. Gilkes, R.J., Schultz, L.G. van Olphen, H. and Mumpton, F.A., (1987) Acid dissolution of synthetic metal-containing goethites and hematites Proceedings of the International Clay Conference Denver, 1985 Bloomington, Indiana Clay Minerals Society 197 204.Google Scholar
Nakamoto, K., (1997) Infrared and Raman Spectra of Inorganic and Coordination Compounds, Part A: Theory and Applications in Inorganic Chemistry New York John Wiley & Sons.Google Scholar
Rietveld, H.M., (1969) A profile refinement method for nuclear and magnetic structures Journal of Applied Crystallography 2 65–71 10.1107/S0021889869006558.Google Scholar
Schulze, D.G., (1982) The identification of iron oxides by differential X-ray diffraction and the influence of aluminium substitution on the structure of goethite Germany Technical University of München, Freising-Weihenstephan PhD thesis.Google Scholar
Schulze, D.G., (1984) The influence of aluminum on iron oxides, VIII. Unit cell dimensions of Al-substituted goethites and estimation of Al from them Clays and Clay Minerals 32 36–44 10.1346/CCMN.1984.0320105.Google Scholar
Schulze, D.G. and Schwertmann, U., (1987) The influence of aluminium on iron oxides: XIII. Properties of goethites synthesized in 0.3 M KOH at 25 °C Clay Minerals 22 83–92 10.1180/claymin.1987.022.1.07.Google Scholar
Schwertmann, U., (1964) Differenzierung der Eisenoxide des Bodens durch Extraktion mit Ammoniumoxalat-Lösung Zeitschrift für Pflanzenernährung Düngung und Bodenkunde 105 194–202 10.1002/jpln.3591050303.Google Scholar
Schwertmann, U. and Carlson, L., (1994) Aluminum influence on iron oxides: XVII. Unit-cell parameters and aluminum substitution of natural goethites Soil Science Society of America Journal 58 256–261 10.2136/sssaj1994.03615995005800010039x.Google Scholar
Schwertmann, U. Gasser, U. and Sticher, H., (1989) Chromium for iron substitution in synthetic goethites Geochimica et Cosmochimica Acta 53 1293–1297 10.1016/0016-7037(89)90063-X.Google Scholar
Shannon, R.D., (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides Acta Crystallographica A32 751–767 10.1107/S0567739476001551.Google Scholar
Singh, B., Smith, D. Fityus, S. and Allman, M., (2001) Heavy metals in soils: sources, chemical reactions and forms Environmental Geotechnics Newcastle, Australia Australian Geomechanical Society 77 93.Google Scholar
Singh, B. and Gilkes, R.J., (1992) Properties and distribution of iron oxides and their association with minor elements in the soils of South-western Australia Journal of Soil Science 43 77–98 10.1111/j.1365-2389.1992.tb00121.x.Google Scholar
Wells, M.A., (1997) Mineral, chemical and magnetic properties of synthetic, metal-substituted goethite and hematite Perth, Australia University of Western Australia PhD thesis.Google Scholar