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| Sample | FeII2p3/2 peak position (eV) | FeII2p1/2 peak position (eV) | FeIII2p3/2 peak position (eV) | FeIII2p1/2 peak position (eV) | Peak area ratio of FeII to FeIII | Proportion of FeII (%) |
|---|---|---|---|---|---|---|
| C-PB-0.3 | 708.63 | 721.47 | 710.88 | 724.52 | 1.62 | 61.77 |
| Y-PB-0.3 | 708.62 | 721.46 | 710.87 | 724.58 | 1.95 | 66.09 |
| Y-PB-15 | 708.65 | 721.47 | 711.16 | 724.12 | 2.21 | 68.84 |
| Y-PB-30 | 708.67 | 721.49 | 711.06 | 724.35 | 2.31 | 69.81 |
| Y-PB-41 | 708.65 | 721.48 | 711.11 | 724.42 | 2.84 | 73.96 |
