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Letter. Crystal structure of a new high-pressure polymorph of topaz-OH
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Masami Kanzaki
Published/Copyright:
April 2, 2015
Abstract
A new high-pressure form of topaz-OH (denoted here topaz-OH II) was obtained at 14 GPa and 1400 °C. The X-ray diffraction pattern of this phase can be indexed by an orthorhombic cell with a = 4.72318(5), b = 8.91480(9), and c = 2.77276(3) Å. The lengths of a and b are similar, but c is approximately a third of that for a previously reported topaz-OH (denoted topaz-OH I). The structural formula of topaz-OH II can be written as (Al0.68Si0.32)(O0.66(OH)0.34)2, suggesting significant cation disorder in the structure. The crystal structure of topaz-OH II is solved using powder synchrotron X-ray diffraction data, and refined with constraints provided by a separate multi-nuclear NMR study. The structure has similarities with topaz-OH I and diaspore (α-AlOOH) structures, having partially occupied double edge-shared octahedral chains, and 2 × 1 tunnels with partially occupied tetrahedral and octahedral sites.
Received: 2010-3-17
Accepted: 2010-4-27
Published Online: 2015-4-2
Published in Print: 2010-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Crystal structure;
high-pressure studies;
phase transition;
order-disorder
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