| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 74170 | Microporous and Mesoporous Materials | 2012 | 6 Pages |
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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Na,K-rich laumontite demonstrates pressure-induced hydration. ► The pressure-induced hydration occurs in two steps. ► The first step of pressure-induced hydration causes an abrupt volume expansion. ► The second step of pressure-induced hydration (0.2–0.75 GPa) is regular. ► The pressure-induced hydration does not affect H-bonds arrangement.
