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Experimental ranges and levels of the effective variables in initial ceramic powders.
| Symbol | Variable | Unit (%) | Level of variables | ||||
|---|---|---|---|---|---|---|---|
| −1.682 | −1 | 0 | 1 | +1.682 | |||
| A | Bi2O3 | mol | 0.16 | 0.3 | 0.5 | 0.7 | 0.84 |
| B | TiO2 | mol | 0.16 | 0.3 | 0.5 | 0.7 | 0.84 |
| C | Sb2O3 | mol | 0.13 | 0.2 | 0.3 | 0.4 | 0.47 |
