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Crystal structure of dehydrated chlorartinite by X-ray powder diffraction

Published online by Cambridge University Press:  01 March 2012

Kunihisa Sugimoto ,
Robert E. Dinnebier  and
Thomas Schlecht
Kunihisa Sugimoto
Affiliation:
Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
Robert E. Dinnebier
Affiliation:
Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
Thomas Schlecht
Affiliation:
Wilhelm-Röntgen-Straße 25/1, D-73760 Ostfildern, Germany
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Abstract

In the course of an investigation of cracks in certain magnesia floors containing the mineral chlorartinite [Mg2(CO3)(H2O)(OH)]Cl·H2O, the dehydration process of chlorartinite was carried out in high vacuum. The crystal structure of dehydrated chlorartinite [Mg2(CO3)(H2O)(OH)]Cl was refined from laboratory X-ray powder diffraction data using the Rietveld method [R3c, a=22.6791(5) Å, c=7.22336(14) Å, V=3217.52(11) Å3, Z=18, Rp=4.13%, Rwp=5.82%]. Dehydrated chlorartinite exhibits the same type of 3D honeycomb zeolite-like crystal structure with large channels as the hydrated form. Compared to the hydrated form, the channels of dehydrated chlorartinite are empty because of the removal of all non-coordinating water molecules with the cell volume shrinking by 4.0%, leading to a more distorted environment of the magnesium atoms.

Keywords

chlorartinitemagnesia cementdehydrationpowder diffraction

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Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 1 , March 2007 , pp. 64 - 67
Copyright
Copyright © Cambridge University Press 2007

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