“…The main peaks of pure NOF located at 22.7, 23.6, 25.9, 31.9, 33.1, 46.2, and 47.5° can be indexed to (001), (110), (600), (510), (111), (002), and (020) planes of orthorhombic Nb 3 O 7 F (JCPDS no. 74-2363) . The XRD pattern of pure CN has two peaks at 13.1 and 27.4°, which can be indexed to (100) and (002) planes, respectively .…”