Table 2.
The variables and employed levels in the CCD for ZnO low voltage varistor fabrication
| |
|
Level of variables |
||
|---|---|---|---|---|
| Symbol | Unit (%) | Low (−1) | Middle (0) | High (+1) |
| Bi2O3 (x1) |
mol |
1.0 |
1.25 |
1.5 |
| TiO2 (x2) | mol | 1.0 | 1.25 | 1.5 |
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