Table 1. Chemical composition (wt%) of the glasses.
| ZnO15 | ZnO25 | ZnO35 | ZnO40 | |
|---|---|---|---|---|
| SiO 2 | 25.53 | 22.53 | 19.29 | 18.02 |
| B 2 O 3 | 45.33 | 40.00 | 34.24 | 32.00 |
| Na 2 O | 7.35 | 6.48 | 5.55 | 5.19 |
| Al 2 O 3 | 6.79 | 5.99 | 5.13 | 4.79 |
| ZnO | 15.00 | 25.00 | 34.73 | 40.00 |
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