Figure 1.
The crystal model of Ni-doped zinc-blende (ZB) ZnO (the gray and white balls indicate Zn and O atoms, respectively). The positions of Zn substituted by Ni are denoted by 1 and 2–3, (a) 2 × 2 × 2 supercell; (b) 1 × 2 × 2 supercell.
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