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Elsevier, Microporous and Mesoporous Materials, (159), p. 126-131

DOI: 10.1016/j.micromeso.2012.04.029

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An X-ray single crystal study of alkaline cations influence on laumontite hydration ability: II. Pressure-induced hydration of Na,K-rich laumontite

Journal article published in 2012 by Sergey V. Rashchenko ORCID, Yurii V. Seryotkin ORCID, Vladimir V. Bakakin
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This paper is available in a repository.

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Abstract

In the present work the influence of alkaline cations on pressure behavior of laumontite |(Ca4−xNax)Kx(H2O)n|[Al8Si16O48] was studied using single-crystal X-ray diffraction in diamond-anvil cell with water medium. Na,K-rich laumontite, containing 13.4 H2O molecules per formula at ambient pressure (0.0001 GPa), hydrates up to ≈15.5 H2O in the pressure range of 0.0001–0.75 GPa. This pressure-induced hydration occurs due to the occupancy increase of already populated water sites and does not cause any essential structure changes. The bulk modulus K0 = 39(3) GPa was evaluated for Na,K-rich laumontite using normalized volumes.