Bibliographic Citation
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Title | Crystal structures of a natural and a Cs-exchanged clinoptilolite |
Creator/Author | Smyth, J.R. ; Spaid, A.T. [Univ. of Colorado, Boulder (USA)] ; Bish, D.L. [Los Alamos National Laboratory, NM (USA)] |
Publication Date | 1990 May 01 |
OSTI Identifier | OSTI ID: 137967 |
Other Number(s) | Journal ID: AMMIAY; ISSN 0003-004X |
Resource Type | Journal Article |
Resource Relation | Journal: American Mineralogist; Journal Volume: 75; Journal Issue: 5-6; Other Information: PBD: May-Jun 1990 |
Subject | 36 MATERIALS SCIENCE ;05 NUCLEAR FUELS; CLINOPTILOLITE; CRYSTAL STRUCTURE; ALUMINIUM OXIDES; CALCIUM OXIDES; CESIUM; CESIUM OXIDES; CHEMICAL COMPOSITION; DIMENSIONS; GEOCHEMISTRY; HIGH-LEVEL RADIOACTIVE WASTES; HYDRATES; ION EXCHANGE; NEVADA TEST SITE; POTASSIUM OXIDES; RADIOACTIVE WASTE DISPOSAL; SILICON OXIDES; SODIUM OXIDES; TUFF; X-RAY DIFFRACTION; ZEOLITES; Yucca Mountain Project |
Description/Abstract | The crystal structures of natural and Cs-exchanged silica-rich clinoptilolite have been refined in space group C2/m using single-crystal X-ray diffraction data (R = 0.062 and 0.083, respectively; all reflections). Chemical formulae of the two structures are Na{sub 1.3}K{sub 1.2}Ca{sub 1.55}Al{sub 6.2}Si{sub 29.8}O{sub 72}{center_dot}23H{sub 2}O and Cs{sub 3.8}Ca{sub 1.2}Al{sub 6.1}Si{sub 29.7}O{sub 72}{center_dot}19H{sub 2}O. Unit-cell dimensions of the two are virtually identical (a = 17.633 {angstrom}, b = 17.941 {angstrom}, c = 7.400 {angstrom}, and {beta} = 116.39{degree} for the natural sample, and a = 17.692 {angstrom}, b = 17.945 {angstrom}, c = 7.404 {angstrom}, and {beta} = 116.36{degree} for the Cs-exchanged sample). The positions of extra-framework cations in the natural sample are similar to those reported previously, except that there is no atom at the position ascribed to Mg, consistent with the low Mg content of the sample. Cs occupies split positions near high-symmetry special positions that are unrelated to the cation positions in the natural sample. All Cs positions have relatively long Cs-H{sub 2}O and Cs-O distances ranging from 3.0 to 3.5 {angstrom}. Clinoptilolite is a major component in tuffs at the Nevada Test Site, a large reservation in southern Nevada used for underground testing of nuclear weapons, and it may be used for future isolation of high-level radioactive wastes. |
Country of Publication | United States |
Language | English |
Format | Size: pp. 522-528; Other: PL: |
System Entry Date | 2004 Jul 13 |
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