Color and band gap of 3d transition metal oxides
| mateials | Band gap (eV) | IBulk | Film (100 nm) | Powder (10 micron) |
| alpha Fe2O3 (Hametite) | 2.34 |  black |  | |
| Fe3O4 | 0.05 |  |  | |
| BiFeO3 | 2.7 |  |  yellow | |
| NiO | 3.4 | black |  | |
| TiO2 | 3.03 | colorless |  |
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