High-resolution 23 Na, 27 Al and 29 Si NMR spectroscopy of framework Aluminosilicate glasses

Details High-resolution 23 Na, 27 Al and 29 Si NMR spectroscopy of framework Aluminosilicate glasses High-resolution 23 Na, 27 Al and 29 Si NMR spectroscopy of framework Aluminosilicate glasses

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2199o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 8, pp.2199-2209

Physics

19

Scientific paper

The results of high-resolution 23 Na, 27 Al and 29 Si NMR spectroscopy of aluminosilicate glasses with MO / Al 2 O 3 or L 2 O / Al 2 O 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 (less negative or more positive) with decreasing Si/ (Si + Al). For 29 Si and 27 Al, this variation parallels the variation of framework crystalline silicates. The 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 23 Na chemical shifts of crystalline samples, and the structural causes of variation in 23 Na chemical shifts are not well understood. The 27 Al and 29 Si chemical shifts of the glasses do not vary significantly with different large (modifier) cations. The 29 Si chemical shifts provide estimates of average bond angles and bond distances and the 27 AL and 29 Si chemical shifts and peak breadths are consistent with a decrease in the tetrahedralring order (number of tetrahedra per ring) 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.

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