Table 1.
Controllable parameters and their levels
| Factor | Description | Level 3 | Level 1 | Level 2 |
|---|---|---|---|---|
| A |
atomic ratios of Fe to Ti (%) |
0.2 |
0.1 |
0.05 |
| B |
Temperature of calcination (°C) |
550 |
450 |
500 |
| C | Time of calcination (h) | 10 | 5 | 7.5 |
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