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

Yu V. Seryotkin, S. N. Dement’ev, A. I. Ancharov

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

2 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)1386-1391
Число страниц6
ЖурналJournal of Structural Chemistry
Том57
Номер выпуска7
DOI
СостояниеОпубликовано - 1 дек 2016

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