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- W1986878578 abstract "Evidence of tungsten oxide diffusion in the gaseous phase has been shown in experimental studies of iron tungstate synthesis (Fe203 + W03→ Fe2WO5). Gas — solid mechanisms for this reaction and its elemantary steps (tungsten oxide volatilization, gaseous diffusion and condensation) have been developed. New kinetic laws for pure volatilization or condensation are given. Some experimental results agree with models of sublimation or condensation, but the comparison between experimental and theoretical kinetic curves indicates that the iron tungstate synthesis is governed at 800 or 760°C by a mixed regime of volatilization and diffusion in the solid phase. L'étude expérimentale de la synthése du tungstate de fer Fe203 + W03 → Fe2WO6 a permis de mettre en évidence le transport en phase gazeuse du trioxyde de tungstène. Nous avons développé les mécanismes gaz-solide pour cette réaction et décrit les étapes de sublimation, diffusion en phase gazeuse et condensation de WO3. De nouvelles lois cinétiques de sublimation pure et de condensation pure ont été formulées. Elles sont cohérentes avec les lois de variation de vitesse observées en fonction de la nature et des pressions de gaz. Cependant la comparaison des courbes cinétiques théoriques et expérimentales permet de conclure que la synthése du tungstate de fer á 800 et 760°C doit être régie par un régime mixte sublimation-diffusion en phase solide." @default.
- W1986878578 created "2016-06-24" @default.
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- W1986878578 date "1984-12-01" @default.
- W1986878578 modified "2023-09-26" @default.
- W1986878578 title "Influence des gaz sur la synthese du tungstate de fer Fe2WO6 III. Etude des mecanismes gaz-solide" @default.
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- W1986878578 doi "https://doi.org/10.1016/0254-0584(84)90056-7" @default.
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