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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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