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Appendix A
Table A.1 Coordination numbers, effective ionic radii, field strengths, and electronegativities of some cations and anions of interest in oxide glasses. Source: Compilation courtesy J.F. Stebbins.
| Coordinationa | Ionic radiusb (Å) | Field strengthb | Electronegativityc | |
|---|---|---|---|---|
| Anions | ||||
| O2− | 2, 6 | 1.35, 1.40 | – | 3.5 |
| F1− | 2, 6 | 1.29, 1.33 | – | 4.0 |
| Cl1− | 6 | 1.81 | – | 3.0 |
| Cations Network formers d | ||||
| Fe3+ | 4, 6 | 0.49, 0.55 | 0.88, 0.82 | 1.8 |
| Ga3+ | 4, 6 | 0.47, 0.62 | 0.90, 0.77 | 1.6 |
| Al3+ | 4, 6 | 0.39, 0.54 | 0.98, 0.83 | 1.5 |
| Te4+ |
3, 4e
| |||