Fig. 3: Atomic resolution STEM-EDS imaging of a crystal of 4Nb2O5·9WO3 oxides.
From: Atomic resolution imaging of cation ordering in niobium–tungsten complex oxides
a A schematic model of the 4Nb2O5·9WO3 crystal. b A HAADF–STEM image showing the individual metal atom columns (white blobs) of the crystal oriented in the [001] direction with respect to the incident electron beam. STEM–EDS images recorded using the c W Mα X-ray (pink) and d Nb Lα X-ray (yellow) lines. All images in panels (a)–(c) were obtained for the same crystal area. The arrows indicate the metal atom columns located in the pentagonal tunnels of the crystal structure. The image intensities of the tunnels in panel (c) are close to zero; however, the corresponding values obtained in panel (d) are very high, suggesting that these sites are predominantly occupied by Nb atoms.
