Table 1 Typical structural properties of the alkali silicate glasses.
Glass | SiO2 | Na100 | Na50K50 | K100 |
---|---|---|---|---|
Density (g·cm−3) | 2.200 | 2.429 | 2.439 | 2.404 |
Number density (Å−3) | 0.06615 | 0.07280 | 0.06866 | 0.06416 |
NNa-O | – | 4.2 | 4.1 | – |
NNa-BO | – | 2.1 | 2.0 | – |
NNa-NBO | – | 2.1 | 2.1 | – |
NK-O | – | – | 5.2 | 4.4 |
NK-BO | – | – | 2.9 | 2.3 |
NK-NBO | – | – | 2.3 | 2.1 |
Average (Si-O)n ring size | 6.6 | 8.3 | 7.9 | 8.1 |
Fraction of large rings (n≧13) (%) | 0 | 5.6 | 7.5 | 11.0 |
Cavity volume ratio | 32.2 | 6.6 | 9.2 | 13.7 |
Maximum cavity volume (Å3) | 14206 | 166 | 323 | 1310 |