Table 4. Number of FeII atoms in relation with the NP size for samples 1.6, 1.10 and 1.2 .
| Sample | Size (nm) | Number of Fe2+ atoms |
| 1.6 | 16 | 3960 |
| 1.10 | 10 | 840 |
| 1.2 | 4 | 40 |
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