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

International Journal of Photoenergy

fig5

Figure 5

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Figure 5 | Neodymium-Doped  with Anatase and Brookite Two Phases: Mechanism for Photocatalytic Activity Enhancement under Visible Light and the Role of Electron 