The split network analysis for exploring composition-structure correlations in multi-component glasses: II. Multinuclear NMR studies of alumino-borosilicates and glass-wool fibers

作者：Eden Mattias^*; Sundberg Peter; Stalhandske Christina

来源：Journal of Non-Crystalline Solids, 2011, 357(6-7): 1587-1594.

DOI：10.1016/j.jnoncrysol.2010.11.101

• Glass structure
• Network polymerization
• BO/NBO distributions
• Silicate
• Alumino-borosilicate
• Glass-wool fiber
• Boron speciation
• Si-29 NMR
• B-11 NMR
• Al-27 NMR

The preceding part [M. Eden, J. Non.-Cryst. Solids, 357, (2011) 1595-1602] introduced the "split network" strategy for estimating the network polymerization degree (r(A)) and mean number of bridging oxygen (BO) atoms ((N) over bar (A)(BO)) for a network former A, given that these parameters are known for all other network builders in the multi-component oxide glass. However, as the detailed ordering of BO and non-bridging oxygen (NBO) species is often difficult to assess experimentally, we summarize some "rules of thumb" for predicting the coordination number and tendency to accept NBO ions for Al3+, B3+, Si4+ and P5+ cations: they are helpful in scenarios devoid of experimental data. Using the parameters r and (N) over bar (BO), we present expressions for the BO/NBO distributions among tetrahedrally coordinated cations, as predicted from the binary and random models. Multinuclear B-11, Al-27 and Si-29 solid-state NMR is exploited to derive the split network representations of a set of Na-Ca-(Al)-(B)-Si-O glasses. These results are subsequently used to gain structural insight into two commercial glass-wool fibers that constitute alumino-borosilicate networks modified by Na+, K+, Ca2+ and Mg2+ ions.

• 出版日期2011-4