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An X-ray diffraction study of the pressure-induced hydration in cordierite at 4–5 GPa
-
Anna Yu. Likhacheva
,
Sergey V. Goryainov
Published/Copyright:
March 7, 2015
Abstract
The elastic and structural behavior of natural cordierite compressed in aqueous medium up to 6 GPa was studied by means of in situ synchrotron powder diffraction with a diamond-anvil cell. In the range between 1-4 GPa the elastic behavior is regular and slightly anisotropic, with linear compressibilities βa:βb:βc = 4:4:5, the most rigid a-b plane coinciding with the orientation of 6-membered rings. A distinct decrease of compressibility in the range of 4-5 GPa indicates a pressure-induced hydration (PIH), which is confirmed by the structure refinements. The addition of about 60% of the initial water content into the cordierite channels proceeds through positional disordering of the H2O sites inside the channel cavity and a stepwise filling of the H2O position inside the 6-membered rings, leading to the phase transition at about 4.7 GPa. The appearance of H2O molecules inside 6-membered rings prevents their contraction and even causes their slight enlargement along the a direction, apparently related to the orientation of H-bonds. This results in an anisotropic deformation of the unit cell and an increase of the a parameter in the HP phase at 4.9 GPa, as well as a decrease of linear compressibility along a upon the further compression up to 6 GPa (βa:βb:βc = 5:9:10).
Keywords : Cordierite; high pressure; compressibility; pressure-induced hydration; crystal structure
Received: 2012-4-16
Accepted: 2012-8-22
Published Online: 2015-3-7
Published in Print: 2013-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Cordierite;
high pressure;
compressibility;
pressure-induced hydration;
crystal structure
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