Figure 1

The crystal structure of (a) simple wurtzite oxide-based materials: ZnO (P63mc), (b) perovskite oxides: CaMnO3 (Pbnm) and (c) layered oxides: BiCuSeO (P4/nmm).
The crystal structure of (a) simple wurtzite oxide-based materials: ZnO (P63mc), (b) perovskite oxides: CaMnO3 (Pbnm) and (c) layered oxides: BiCuSeO (P4/nmm).