Computer Science
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000gecoa..64..883z&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 64, Issue 5, pp.883-896
Computer Science
3
Scientific paper
A variety of 29 Si, 27 Al, 23 Na, 17 O and 1 H NMR data are consistent with the formation of Q 3 AlOH and SiOH groups upon dissolution of H 2 O into aluminosilicate glasses. 29 Si single-pulse and 1 H- 29 Si CP/MAS data present more direct evidence for the formation of Q 3 Si species. A model that involves rupture of Si-O-Si, Al-O-Si, and Al-O-Al linkages, and possibly cation exchange between H + and Na + is most consistent with the variety of data available. In this model the water dissolution process involves several reactions that are likely to proceed concurrently throughout the glass compositional space defined by Al/Si ratio and water content. Because the types of reactions do not change with Al/Si ratio, this model predicts smooth variations in hydroxyl and molecular water species abundances throughout compositional space within the system NaAlSiO 4 -SiO 2 -H 2 O.
Grey Clare P.
Nekvasil Hanna
Zeng Qiang
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