Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by Fechtelkord, M. Articles by Raudsepp, M. Search for Related Content GeoRef GeoRef Citation

Characterization of synthetic Cs-Li cancrinite grown in a butanediol-water system: An NMR spectroscopic and Rietveld refinement study

¹ Institut für Mineralogie, Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
² University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver, B.C. V6T 1Z1, Canada
³ University of British Columbia, Department of Earth and Ocean Sciences, 6339 Stores Road, Vancouver, B.C. V6T 1Z4, Canada

Correspondence: ^* E-mail: M.Fechtelkord{at}mineralogie.uni-hannover.de

A Cs-Li-analogue of cancrinite has been synthesized from tetraethoxysilane and Al sec-butoxide in a mixture of 1,3-butanediol and water. Cs and Li were introduced as hydroxides. Synthesis was done at autogeneous pressure and T = 473 K for 100 h. The synthesis product was characterized by powder X-ray diffraction, IR-spectroscopy, thermogravimetry, ¹H, ⁶Li, ⁷Li, ¹³³Cs, ²⁷Al, ²⁹Si MAS, and {¹H} ¹³C CPMAS NMR and Rietveld structure refinement. ²⁹Si MAS NMR and ²⁷Al MAS NMR spectroscopy show a framework with strong alternating order of the SiO₄ and AlO₄ tetrahedra and an Si/Al ratio of one. ⁶Li MAS NMR suggests the existence of two different signals that cannot be resolved in the ⁷Li MAS NMR spectrum. ¹³³Cs MAS NMR shows only a single resonance. The thermogravimetric analysis reveals a continuous weight loss in several steps, indicating the evaporation of water of hydration. IR spectroscopy shows evidence for hydroxyl anions and water included in the cancrinite framework. The Rietveld structure refinement is consistent with a completely ordered alumosilicate framework with an Si/Al ratio of one and the presence of both molecular water and hydroxyl groups in the hexagonal channel, a result different from the previously published structure. Cs is exclusively located in the -cages; Li ions are located in the channels and are coordinated by water molecules.

This article has been cited by other articles:

				E. Bonaccorsi and S. Merlino Modular Microporous Minerals: Cancrinite-Davyne Group and C-S-H Phases Reviews in Mineralogy and Geochemistry, January 1, 2005; 57(1): 241 - 290. [Full Text] [PDF]

				M. FECHTELKORD, B. POSNATZKI, and J.-C. BUHL Characterization of basic cancrinite synthesized in a butanediol-water system European Journal of Mineralogy, June 1, 2003; 15(3): 589 - 598. [Abstract] [Full Text] [PDF]