High-pressure spectroscopic study of hydrous and anhydrous Cs-exchanged natrolites

Liu, Dan, Seoung, Donghoon, Lee, Yongmoon, Liu, Zhenxian, Lee, Jong-Won, Yoon, Ji-Ho and Lee, Yongjae 2012, High-pressure spectroscopic study of hydrous and anhydrous Cs-exchanged natrolites, Journal of physical chemistry C, vol. 116, no. 3, pp. 2159-2164, doi: 10.1021/jp206678e.

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Title High-pressure spectroscopic study of hydrous and anhydrous Cs-exchanged natrolites
Author(s) Liu, DanORCID iD for Liu, Dan orcid.org/0000-0001-6875-419X
Seoung, Donghoon
Lee, Yongmoon
Liu, Zhenxian
Lee, Jong-Won
Yoon, Ji-Ho
Lee, Yongjae
Journal name Journal of physical chemistry C
Volume number 116
Issue number 3
Start page 2159
End page 2164
Total pages 6
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2012
ISSN 1932-7447
Summary Structural phase transitions in hydrous Cs-exchanged natrolite (Cs-NAT-hyd) and anhydrous Cs-exchanged natrolite (Cs-NAT-anh) have been investigated as a function of pressure and temperature using micro-Raman scattering and synchrotron infrared (IR) spectroscopy with pure water as the penetrating pressure medium. The spectroscopic results indicate that Cs-NAT-hyd undergoes a reversible phase transition around 4.72 GPa accompanied by the discontinuous frequency shifts of the breathing vibrational modes of the four-ring and helical eight-ring units of the natrolite framework. On the other hand, we observe that Cs-NAT-anh becomes rehydrated at 0.76 GPa after heating to 100 °C and then transforms into two distinctive phases at 2.24 and 3.41 GPa after temperature treatments at 165 and 180 °C, respectively. Both of these high-pressure phases are characterized by the absence of the helical eight-ring breathing modes, which suggests the collapse of the natrolite channel and formation of dense high-pressure polymorphs. Together with the fact that these high-pressure phases are recoverable to ambient conditions, our results imply a novel means for radionuclide storage utilizing pressure and a porous material.
Language eng
DOI 10.1021/jp206678e
Field of Research 020406 Surfaces and Structural Properties of Condensed Matter
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, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047834

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