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Structural evolution of Li-exchaned natrolite at pressure-induced over-hydration: An X-ray diffraction study

  • Applications of Synchrotron Radiation in Structural Chemistry
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Abstract

The behavior of Li-exchanged natrolite Li1.92Na0.10[Al2.02Si2.98O10]∙2H2O at compression in penetrating (water-containing) medium was studied by in situ synchrotron powder diffraction in diamond anvil cell up to 2.5 GPa. Within 0-1.3 GPa the compression is almost isotropic, and upon the further pressure increase the sample undergoes additional hydration, leading to abrupt volume expansion by 22%, a record value for natrolite. In the proposed model for the high-pressure phase Li2[Al2Si3O10]∙6H2O the Li+ cations have no contact with the framework O-atoms and are surrounded by “water-jacket” in the form of semi-octahedron (tetragonal pyramid) composed of five H2O molecules. Such polyhedra, lining up along the channel axis, are joined through their edges and create a “water” column expanding the structure.

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Correspondence to Yu. V. Seryotkin.

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Translated from Zhurnal Strukturnoi Khimii, Vol. 57, No. 7, pp. 1453-1462, September-October, 2016.

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Seryotkin, Y.V., Likhacheva, A.Y. & Rashchenko, S.V. Structural evolution of Li-exchaned natrolite at pressure-induced over-hydration: An X-ray diffraction study. J Struct Chem 57, 1377–1385 (2016). https://doi.org/10.1134/S0022476616070118

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  • DOI: https://doi.org/10.1134/S0022476616070118

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