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Mesostructured materials containing niobium in the framework were prepared using layered-perovskite type potassium niobium oxyfluoride and hexadecyltrimethylammonium chloride. The meso- and localstructure were characterized by X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) analysis. XRD analysis showed that lamellar structure was formed in the materials prepared at pH 10.5. EXAFS analysis showed that octahedral Nb06 unit of the materials at pH 10.5 have the linkages of edge-shared structure. The both analysis also showed that mesostructured materials prepared at pH 3.0 had 2d-hexagonal structure and the number of linkages of edge-shared structure decreased.

EXAFS and XRD Studies on Nb-Mesostructured Materials Prepared from Layered-Perovskite Type Potassium Niobium Oxyfluoride