Fig. 6
From: Polar surface structure of oxide nanocrystals revealed with solid-state NMR spectroscopy
Structure of M2 and M3. White and off-white spheres represent hydrogen and cerium ions, respectively, in the top view of M2 (a) and M3 (b). Surface oxygen groups with different chemical shifts are in different colors. For each CeO4-t surface unit of M2, four hydrogen ions labeled as H1, H2, H3, and H4 form from the two dissociative H2O molecules while for each CeO4-t surface unit of M3, six hydrogen ions labeled as H1, H2, H3, H4, H5, and H6 form from the three dissociative H2O molecules.
