Formation of sodium and copper vanadium oxibronzes via oxalate decomposition: Thermal and X ray studies
| Autor: | J. Galy, D. Ballivet-Tkatchenko, A. Medouar, J.M. Savariault, J.-L. Parize |
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| Rok vydání: | 1989 |
| Předmět: |
Chemistry
Mechanical Engineering Sodium Thermal decomposition Inorganic chemistry chemistry.chemical_element Vanadium Sodium oxalate Condensed Matter Physics Copper Oxalate chemistry.chemical_compound Mechanics of Materials Differential thermal analysis Pentoxide General Materials Science Nuclear chemistry |
| Zdroj: | Materials Research Bulletin. 24:1147-1153 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/0025-5408(89)90073-1 |
| Popis: | The thermal decomposition of sodium and copper oxalates in the presence of vanadium pentoxide in a 0.5:1 molar ratio affords the vanadium bronzes α′-NaV 2 O 5 and β-Cu 0.5 V 2 O 5 . The use of complementary techniques such as TG, DTA, gaz analysis and X-ray powder diffraction permit to propose a reaction scheme for the formation of the above-mentioned compounds. Copper oxalate leads to CO 2 and metallic copper which then incorporates to V 2 O 5 . The reaction mechanism for sodium oxalate is less straightforward. A new phase, β′Na x V 2 O 5 has been characterized during the course of the formation of NaV 2 O 5 . |
| Databáze: | OpenAIRE |
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