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Abstract:
Complex Mo,V-based mixed oxides that crystallize in the orthorhombic
M1-type structure are promising candidates for the selective oxidation
of small alkanes. The oxygen sublattice of such a complex oxide has been
studied by annular bright field scanning transmission electron
microscopy. The recorded micrographs directly display the local
distortion in the metal oxygen octahedra. From the degree of distortion
we are able to draw conclusions on the distribution of oxidation states
in the cation columns at different sites. The results are supported by
X-ray diffraction and electron paramagnetic resonance measurements that
provide integral details about the crystal structure and spin coupling,
respectively.
