Crystal Research and Technology
Cryst. Res. Technol. 38, 153 (2003) - Abstract -

Crystallographic shear defect in molybdenum oxides: Structure and TEM of molybdenum sub-oxides Mo18O52 and Mo8O23

Di Wang, Dangsheng Su, Robert Schlögl

Fritz-Haber-Institute der Max-Planck-Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4-6, Berlin, 14195, Germany

Keywords    molybdenum oxides, crystallographic shear, electron diffraction pattern, high-resolution electron microscopy, image simulation

Molybdenum trioxide and molybdenum sub-oxides are of great interests in catalysis due to their utilities as model system to elucidate the correlations between the structure and the catalytic performance. The sub-oxides are usually an intermediate phase during catalytic reaction in which the lattice oxygen is involved. We show the identification of the two common molybdenum sub-oxides Mo18O52 and Mo8O23, derived from MoO3 by crystallographic shearing (CS), by means of electron diffraction and High-Resolution Transmission Electron Microscopy (HRTEM) in combination with image simulation. The coincidence of simulated electron diffraction patterns and high-resolution images with the experimental ones indicates the feasibility of CS structure determination by these techniques.



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