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Title: High-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of framework aluminosilicate glasses

Abstract

The results of high-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of aluminosilicate glasses with MO/Al/sub 2/O/sub 3/ or L/sub 2/O/Al/sub 2/O/sub 3/ = 1 (M = +2, L = +1 cations) shows that these glasses have a fully polymerized tetrahedral framework structure with only a defect level of non-bridging oxygens. The chemical shifts of the peak maxima for all three nuclides become less shielded with decreasing Si/(Si + Al). For /sup 29/Si and /sup 27/Al, this variation parallels the variation of framework crystalline silicates. The /sup 23/Na chemical shifts for the glasses becomes less shielded (less negative) with decreasing Na/(Na + K), opposite to the trend for crystalline alkali feldspars. Few data exist for the /sup 23/Na chemical shifts of crystalline samples, and the structural causes of variation in /sup 23/Na chemical shifts are not well understood. The /sup 27/Al and /sup 29/Si chemical shifts of the glasses do not vary significantly with different large (modifier) cations. The /sup 29/Si chemical shifts provide estimates of average Si-O-T (T = Si, Al) bond angles and Si-O bond distances, and the /sup 27/Al and /sup 29/Si chemical shifts and peak breadths are consistent with a decrease in the tetrahedralmore » ring order with decreasing Si/(Si +Al). The data presented here for fully polymerized glasses form a base from which the data for aluminosilicate glasses containing both fully polymerized sites and less polymerized sites can be interpreted.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Illinois, Urbana (USA)
OSTI Identifier:
5062831
DOE Contract Number:  
FG02-85ER13437
Resource Type:
Journal Article
Journal Name:
Geochim. Cosmochim. Acta; (United States)
Additional Journal Information:
Journal Volume: 51:8
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; GLASS; MOLECULAR STRUCTURE; NUCLEAR MAGNETIC RESONANCE; STRUCTURAL CHEMICAL ANALYSIS; SILICON OXIDES; ALUMINIUM; BOND ANGLE; CHEMICAL SHIFT; GEOCHEMISTRY; MOLECULAR MODELS; POLYMERIZATION; SILICON; SODIUM; SPECTROSCOPY; ALKALI METALS; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; ELEMENTS; MAGNETIC RESONANCE; MATHEMATICAL MODELS; METALS; OXIDES; OXYGEN COMPOUNDS; RESONANCE; SEMIMETALS; SILICON COMPOUNDS; 580400* - Geochemistry- (-1989)

Citation Formats

Oestrike, R, Yang, W H, Kirkpatrick, R J, Hervig, R L, Navrotsky, A, and Montez, B. High-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of framework aluminosilicate glasses. United States: N. p., 1987. Web. doi:10.1016/0016-7037(87)90269-9.
Oestrike, R, Yang, W H, Kirkpatrick, R J, Hervig, R L, Navrotsky, A, & Montez, B. High-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of framework aluminosilicate glasses. United States. https://doi.org/10.1016/0016-7037(87)90269-9
Oestrike, R, Yang, W H, Kirkpatrick, R J, Hervig, R L, Navrotsky, A, and Montez, B. Sat . "High-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of framework aluminosilicate glasses". United States. https://doi.org/10.1016/0016-7037(87)90269-9.
@article{osti_5062831,
title = {High-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of framework aluminosilicate glasses},
author = {Oestrike, R and Yang, W H and Kirkpatrick, R J and Hervig, R L and Navrotsky, A and Montez, B},
abstractNote = {The results of high-resolution /sup 23/Na, /sup 27/Al, and /sup 29/Si NMR spectroscopy of aluminosilicate glasses with MO/Al/sub 2/O/sub 3/ or L/sub 2/O/Al/sub 2/O/sub 3/ = 1 (M = +2, L = +1 cations) shows that these glasses have a fully polymerized tetrahedral framework structure with only a defect level of non-bridging oxygens. The chemical shifts of the peak maxima for all three nuclides become less shielded with decreasing Si/(Si + Al). For /sup 29/Si and /sup 27/Al, this variation parallels the variation of framework crystalline silicates. The /sup 23/Na chemical shifts for the glasses becomes less shielded (less negative) with decreasing Na/(Na + K), opposite to the trend for crystalline alkali feldspars. Few data exist for the /sup 23/Na chemical shifts of crystalline samples, and the structural causes of variation in /sup 23/Na chemical shifts are not well understood. The /sup 27/Al and /sup 29/Si chemical shifts of the glasses do not vary significantly with different large (modifier) cations. The /sup 29/Si chemical shifts provide estimates of average Si-O-T (T = Si, Al) bond angles and Si-O bond distances, and the /sup 27/Al and /sup 29/Si chemical shifts and peak breadths are consistent with a decrease in the tetrahedral ring order with decreasing Si/(Si +Al). The data presented here for fully polymerized glasses form a base from which the data for aluminosilicate glasses containing both fully polymerized sites and less polymerized sites can be interpreted.},
doi = {10.1016/0016-7037(87)90269-9},
url = {https://www.osti.gov/biblio/5062831}, journal = {Geochim. Cosmochim. Acta; (United States)},
number = ,
volume = 51:8,
place = {United States},
year = {1987},
month = {8}
}