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Positions of the most intensive lines in the Raman spectra of tested samples [34].
| peak position [cm−1] | assignment |
| 524, 673–683 | Fe3O4 |
| 322–335, 704–715 | γ-Fe2O3 |
| 224, 604 | α-Fe2O3 |
| 1335–1383 | C–C aliphatic chain/γ-Fe2O3 |
| 1049, 1166, 1415, 1585 | C–C, aromatic ring chain vibrations |
