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Morphology and structure characteristics of CAO. (a) Schematic illustration of the synthestic procedure of CAO. (b) SEM image and (c) XRD pattern of CAO. (d) Crystal structure of CaAl2O4 host matrix. (e) TEM image, (f) HAADF-STEM image and (g) ABF-STEM image of CAO. The inset images in the lower right corner are the corresponding enlarged HAADF-STEM and ABF-STEM images. (h) STEM and the corresponding EDS mapping images of CAO.
