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Spectroscopic characterization of alkali-metal exchanged natrolites

Liu, Dan, Liu, Zhenxian, Lee, Yongmoon, Seoung, Donghoon and Lee, Yongjae 2012, Spectroscopic characterization of alkali-metal exchanged natrolites, American mineralogist, vol. 97, no. 2-3, pp. 419-424, doi: 10.2138/am.2012.3932.

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Title Spectroscopic characterization of alkali-metal exchanged natrolites
Author(s) Liu, DanORCID iD for Liu, Dan orcid.org/0000-0001-6875-419X
Liu, Zhenxian
Lee, Yongmoon
Seoung, Donghoon
Lee, Yongjae
Journal name American mineralogist
Volume number 97
Issue number 2-3
Start page 419
End page 424
Total pages 6
Publisher Mineralogical Society of America
Place of publication Chantilly, Va.
Publication date 2012-02
ISSN 0003-004X
1945-3027
Keyword(s) alkali-metal exchange
micro-raman spectroscopy
natrolite
synchrotron infrared spectroscopy
Summary Synchrotron infrared (IR) and micro-Raman spectroscopic studies have been performed on zeolite natrolites as a function of the non-framework composition at ambient conditions. This establishes the spectroscopic characterization of the ion-exchanged natrolites in the alkali-metal series both in the as-prepared hydrated (M-NAT-hyd, M = Li, Na, K, Rb, and Cs) and some stable dehydrated forms (M-NAT-deh, M = Rb and Cs). The former series exhibits non-framework cation-size dependent opening of the helical channels to span ca. 21° range in terms of the chain rotation angle, ? (or ca. 45° range in terms of the chain bridging angle, T-O2-T). For these hydrated phases, both IR and Raman spectra reveal that the degree of the red-shifts in the frequencies of the helical 8-ring channel as well as the 4-ring unit is proportional to the ionic radius of the non-framework cations. Linear fits to the data show negative slopes of -55.7 from Raman and -18.3 from IR in the 8-ring frequencies and ionic radius relationship. The spectroscopic data are also used to identify the modes of the dehydration-induced "collapse" of the helical 8-ring channels as observed in the stable anhydrous Rb-NAT-deh and Cs-NAT-deh. In addition, we demonstrate that the spectroscopic data in the hydrated series can be used to distinguish different water arrangements along the helical channels based on the frequency shifts in the H-O-H bending band and the changes in the O-H stretching vibration modes.
Language eng
DOI 10.2138/am.2012.3932
Field of Research 040306 Mineralogy and Crystallography
020503 Nonlinear Optics and Spectroscopy
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2012, Mineralogical Society of America
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047726

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Mon, 03 Sep 2012, 13:52:08 EST

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