Table 3 Number of bond-stretching (BS) and bond-bending (BB) constraints created by each atomic species present within the glass network. Note that, although each BS constraint is necessarily associated with a bond between a cation and an O atom, the BS constraints are for convenience here fully associated with the cations.
Atomic species | BS | BB |
|---|---|---|
Si | 4 | 5 |
BIII | 3 | 3 |
BIV | 4 | 0 |
Al | 4 | 5 |
Zr | 6 | 0 |
Na | 1 | 0 |
Li | 1 | 0 |
Ca | 2 | 0 |
BO | – | 1 |
NBO | – | 0 |
