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. 2016 Mar 31;6:23900. doi: 10.1038/srep23900

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(a) XRD patterns of: (i) CeO₂ standard card (JCPDS No. 34–0394), (ii) CeO₂ microspheres, (iii) Cu₂O standard card (JCPDS No. 34–1354) and Cu_xCeO_2−X microspheres (The black arrow indicating diffraction peak from substituted Cu₂O.) and (b) XPS of M_xCeO_2−X microspheres at the Ce 3d region: Cu_xCeO_2−X, Co_xCeO_2−X, Ni_xCeO_2−X, Mn_xCeO_2−X and Fe_xCeO_2−X.