Oxidation Products of Nb4W13O47: A Transmission Electron Microscopy Study
| Autor: | Frank Krumeich, R. Gruehn, C. Bartsch |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Materials science
Valency Oxide Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound Crystallography Planar chemistry Octahedron Transmission electron microscopy Phase (matter) Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry |
| Zdroj: | Journal of Solid State Chemistry. 120:268-274 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1995.1408 |
| Popis: | Nb4W13O47, a mixed valency oxide crystallizing in the structure of the 4:9 phase (4Nb2O5·9WO3), was oxidized at various temperatures. The products have been characterized by high-resolution transmission electron microscopy. Oxidation products obtained at 600 and 1000°C exhibit the development of planar defects running along {110} of the TTB subcell. The defects are built up by structural elements observed here for the first time: Two or more five-membered rings of octahedra are connected via two common octahedra. These arrays are combined with blocks of ReO3-type structure and ordered along the defect planes. The oxidation at 1200°C leads to a separation into the 2:7 phase and WO3. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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