High-Energy Milling of WO3 Oxides: Amorphization and Reaction with Cs2CO3
| Autor: | S. Laruelle, M. Figlarz |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Inorganic chemistry
Oxide Pyrochlore engineering.material Condensed Matter Physics Chemical reaction Electronic Optical and Magnetic Materials Grinding Inorganic Chemistry chemistry.chemical_compound Tungstate chemistry Chemical engineering Materials Chemistry Ceramics and Composites engineering Crystallite Physical and Theoretical Chemistry Ball mill Monoclinic crystal system |
| Zdroj: | Journal of Solid State Chemistry. 111:172-177 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1994.1214 |
| Popis: | Three WO3 oxides with ReO3-, pyrochlore-, and hexagonal-type structures have been studied in nonreactive and reactive grinding conditions by high-energy ball milling. In nonreactive grinding conditions, pyrochlore- and hexagonal-type WO3 oxides amorphize by collapse of the oxide structure. Monoclinic WO3 cannot be amorphized in these experimental conditions: the effect of high-energy ball milling is to decrease the crystallite size to a limit value. In reactive grinding conditions WO3 + Cs2CO3 mixtures lead to the formation of a lacunar cubic pyrochlore-type cesium tungstate. The reaction kinetics are strongly influenced by the WO3 oxide structure and its behavior in nonreactive grinding. The mechanochemical reactivity is higher for monoclinic WO3 and seems to depend on the presence of intercrystallite boundaries rather than on the amorphous oxide phase. |
| Databáze: | OpenAIRE |
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