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<table>High-resolution XPS spectrum of Nd 3d for Nd-doped TiO<sub>2</sub> with Ti : Nd = 11 : 1.</table>

International Journal of Photoenergy

fig4

Figure 4

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Figure 4 | Neodymium-Doped  with Anatase and Brookite Two Phases: Mechanism for Photocatalytic Activity Enhancement under Visible Light and the Role of Electron 