Abstract
The behavior of K-exchanged gonnardite K2.18Na0.04Ca0.02(H2O)2.2[Al2.26Si2.74O10] at compression in penetrating water-containing medium was studied by synchrotron powder diffraction in diamond anvil cell. In contrast to the initial gonnardite, which exhibits the transition to high-hydrated paranatrolite at elevated humidity, its K-exchanged form is not capable of over-hydration even at high pressure. Within the whole studied pressure range (up to 4.8 GPa) the sample experiences the compression. At 3.5-4 GPa the compression anomaly is observed, which is interpreted as a phase transition accompanied by the symmetry lowering from tetragonal to monoclinic. The high-pressure structure evolution of K-exchanged forms of gonnardite and natrolite is compared; the difference in their behavior is explained by distinct configuration of the framework water-cation subsystem.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 57, No. 7, pp. 1463-1468, September-October, 2016.
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Seryotkin, Y.V., Dement’ev, S.N. & Ancharov, A.I. The influence of extraframework cations on the behavior of K-exchanged gonnardite at high pressure. J Struct Chem 57, 1386–1391 (2016). https://doi.org/10.1134/S002247661607012X
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DOI: https://doi.org/10.1134/S002247661607012X