research papers
The present paper provides new information on the attribution of the cationic sites of the orthorhombic Ce10W22O81 crystal phase prepared in the CeO2–Ce2O3–WO3 ternary system. Atomic resolution HAADF-STEM (high-angle annular dark-field scanning transmission electron microscopy) and HREM (high-resolution electron microscopy) investigations have highlighted the presence of two mixed columns of Ce and W cations along the a axis that were previously assigned to pure W cations in the asymmetric unit. This discovery explains the presence of a commensurate superstructure doubling the orthorhombic unit-cell length ao.
Keywords: scheelite-like structure; commensurate superstructures; high-resolution electron microscopy; HREM projection symmetries; high-angle annular dark-field scanning transmission electron microscopy; atomic resolution HAADF-STEM quantification.
Supporting information
Text file https://doi.org/10.1107/S1600576718001103/ks5584sup1.txt | |
Text file https://doi.org/10.1107/S1600576718001103/ks5584sup2.txt |