Direct Imaging of Octahedral Distortion in a Complex Molybdenum Vanadium Mixed Oxide

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...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie 2015-06, Vol.127 (23), p.6932-6935
Main Authors: Lunkenbein, Thomas, Girgsdies, Frank, Wernbacher, Anna, Noack, Johannes, Auffermann, Gudrun, Yasuhara, Akira, Klein-Hoffmann, Achim, Ueda, Wataru, Eichelbaum, Maik, Trunschke, Annette, Schlögl, Robert, Willinger, Marc G.
Format: Article
Language:English
Subjects:
Aberrationskorrigierte Elektronenmikroskopie
Bindungswinkel
Cations
Chemistry
Crystal structure
Diffraction
Distortion
Electron paramagnetic resonance
Hell- und Dunkelfeldmikroskopie
Imaging
Leichte Elemente
Micrographs
Mixed oxides
Molybdenum
Transmission electron microscopy
Transmissionselektronenmikroskopie
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. ABF‐STEM (Hellfeld‐Rastertransmissionselektronenmikroskopie mit ringförmigem Detektor) wurde zur Untersuchung eines strahlungsempfindlichen (Mo,V)‐Mischoxids verwendet. Die Bilder zeigen das Sauerstoffuntergitter und die lokale Verzerrung in den Metall‐Sauerstoff‐Oktaedern. Aus dieser beobachteten Verzerrung lassen sich alleine durch das Betrachten der Atomanordnung Schlüsse auf den Oxidationszustand jedes Metallatoms ziehen.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201502236