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Mineralogy of Al-substituted goethites

Published online by Cambridge University Press:  01 March 2012

Deyu Li ,
Brian H. O’Connor ,
It-Meng Low ,
Arie van Riessen  and
Brian H. Toby
Deyu Li
Affiliation:
Department of Imaging and Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
Brian H. O’Connor
Affiliation:
Department of Imaging and Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
It-Meng Low
Affiliation:
Department of Imaging and Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
Arie van Riessen
Affiliation:
Department of Imaging and Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
Brian H. Toby*
Affiliation:
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8563
*
a)Present address: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439-4856.
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Abstract

The structural models of three synthetic Al-substituted goethite specimens have been refined from the neutron data, including crystallographic determinations of the Al levels and H positions. The d-I data were calculated for the final models. A relationship between the c unit cell parameter and Al content has been extended to the entire goethite-diaspore solid-solution system, which makes the regression equation procedure simpler and more accurate. A second prospective H site could not be confirmed because of the quality of existing neutron data. However, it is hoped that a further neutron powder diffraction study of a synthetic, fully deuterated goethite material may allow the existence of the site to be demonstrated.

Keywords

Al-substituted goethiteneutron powder diffractionmineralogy of Al-goethitestructural model of Al-goethite
Type
Technical Articles
Information
Powder Diffraction , Volume 21 , Issue 4 , December 2006 , pp. 289 - 299
Copyright
Copyright © Cambridge University Press 2006

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References

Busing, W. R. and Levy, H. A. (1958). “A single crystal neutron diffraction study of diaspore, AlO(OH),” Acta Crystallogr. ACCRA9 10.1107/S0365110X58002243 11, 798–803.CrossRefGoogle Scholar
Fazey, P. G., O’Connor, B. H., and Hammond, L. C. (1991). “X-ray powder diffraction Rietveld characterization of synthetic aluminium-substituted goethite,” Clays and Clay Miner. CLCMAB 39, 248–253.CrossRefGoogle Scholar
Golden, D. C. (1978). “Physical and chemical properties of aluminium-substituted goethite,” Ph.D. thesis, North Carolina State University, Raleigh, North Carolina (University Microfilms Inc., 78/20029).Google Scholar
Hazemann, J.-L, Barar, J.-F., and Manceau, A. (1991). “Rietveld studies of aluminium-iron substitution in synthetic goethite,” Mater. Sci. Forum MSFOEP 79–82, 821–826.Google Scholar
Hill, R. J. (1979). “Crystal structure refinement and electron density distribution in diaspore,” Phys. Chem. Miner. PCMIDU 10.1007/BF00307552 5, 179–200.CrossRefGoogle Scholar
Larson, A. C. and Von Dreele, R. B. (2000). “GSAS, The General Structure Analysis System,” Los Alamos National Laboratory, Version of November 2002.Google Scholar
Schulze, D. G. (1984). “The influence of aluminium on iron oxides, VIII. Unit-cell dimensions of Al-substituted goethites and estimation of Al from them,” Clays and Clay Miner. CLCMAB 32, 36–44.CrossRefGoogle Scholar
Szytula, A., Burewicz, A., Dimitrijevic, Z., Krasnicki, S., Rzany, H., Todorovic, J., Wanic, A., and Wolski, W. (1968). “Neutron diffraction studies of alpha-FeOOH,” Phys. Status Solidi PHSSAK 26, 429–434.CrossRefGoogle Scholar
Thiel, R. (1963). “Zum system α-FeOOH-α-AlOOH,” Z. Anorg. Allg. Chem. ZAACAB 326, 70–78.CrossRefGoogle Scholar
Toby, B. H. (2001). “EXPGUI, a graphical user interface for GSAS,” J. Appl. Crystallogr. JACGAR 10.1107/S0021889801002242 34, 210–213.Google Scholar