Table 1. Characteristics of the Synthesizing Materials.
| sample | Er content, x | Co/Fe/citric acid molar ratio |
|---|---|---|
| 1 | 0 | 1:2:3 |
| 2 | 0.05 | 1:1.95:3 |
| 3 | 0.10 | 1:1.90:3 |
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