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| mol % | ||||||
|---|---|---|---|---|---|---|
| P2O5 | CaO | Na2O | CoO | CuO | ZnO | |
| undoped (UPG) | 50 | 30 | 20 | 0 | 0 | 0 |
| Co | 50 | 25 | 20 | 5 | 0 | 0 |
| Cu | 50 | 25 | 20 | 0 | 5 | 0 |
| Zn | 50 | 25 | 20 | 0 | 0 | 5 |
| Co + Cu | 50 | 20 | 20 | 5 | 5 | 0 |
| Co + Zn | 50 | 20 | 20 | 5 | 0 | 5 |
| Cu + Zn | 50 | 20 | 20 | 0 | 5 | 5 |
