Инд. авторы:	Seryotkin Y.V., Dement’ev S.N., Ancharov A.I.
Заглавие:	The influence of extraframework cations on the behavior of K-exchanged gonnardite at high pressure
Библ. ссылка:	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 // Journal of Structural Chemistry. - 2016. - Vol.57. - Iss. 7. - P.1386-1391. - ISSN 0022-4766. - EISSN 1573-8779.
Внешние системы:	DOI: 10.1134/S002247661607012X; SCOPUS: 2-s2.0-85009948995; WoS: 000392616400012;
Реферат:	eng: 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. © 2017, Pleiades Publishing, Ltd.
Ключевые слова:	K-natrolite; K-gonnardite; high pressure; over-hydration; zeolites;
Издано:	2016
Физ. характеристика:	с.1386-1391