TY - JOUR

T1 - The influence of extraframework cations on the behavior of K-exchanged gonnardite at high pressure

AU - Seryotkin, Yu V.

AU - Dement’ev, S. N.

AU - Ancharov, A. I.

PY - 2016/12/1

Y1 - 2016/12/1

N2 - 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.

AB - 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.

KW - high pressure

KW - K-gonnardite

KW - K-natrolite

KW - over-hydration

KW - zeolites

UR - http://www.scopus.com/inward/record.url?scp=85009948995&partnerID=8YFLogxK

U2 - 10.1134/S002247661607012X

DO - 10.1134/S002247661607012X

M3 - Article

AN - SCOPUS:85009948995

VL - 57

SP - 1386

EP - 1391

JO - Journal of Structural Chemistry

JF - Journal of Structural Chemistry

SN - 0022-4766

IS - 7

ER -