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<table>High-resolution XPS spectra of O 1s for pure TiO<sub>2</sub> (a) Nd-doped TiO<sub>2</sub> with Ti : Nd = 11 : 1 (b).</table>

International Journal of Photoenergy

fig6

Figure 6

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Figure 6 | Neodymium-Doped  with Anatase and Brookite Two Phases: Mechanism for Photocatalytic Activity Enhancement under Visible Light and the Role of Electron 