Fig. 1: Morphological characterizations of ZnGa₂O₄.

a X-ray diffraction pattern of the prepared ZnGa₂O₄. b SEM images of ZnGa₂O₄. c TEM image. d HRTEM image. e Polycrystalline electron diffraction pattern of ZnGa₂O₄. f Scanning transmission electron microscopy electron energy loss spectroscopy (STEM-EELS) of the ZnGa₂O₄.