The influence of the atmosphere on the reactivity of uranium oxide powders (1960)
Creators
- 1. Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires
Description
The reactivity of the UO2 powders in different atmospheres (hydrogen, vacuum or argon) has been studied by measuring their specific surface. The influence of the non stoichiometry has also been examined. The experiments give the following results: - in hydrogen the specific surface of the UO2 powder decreases from 900 deg. C; - in argon or under vacuum the surface of a stoichiometric oxide quickly decreases between 700 and 800 deg. C, the effect being more important as the initial surface is larger. If traces of oxygen are present before the experience, the surface begins to diminish at 500 deg. C. Conclusion: there is a relation between the reactivity of UO2 powder and its specific surface. The reactivity is higher in argon or under vacuum than in hydrogen, and it is higher for a non stoichiometric oxide. (author)
Availability note (English)
Available from INIS in electronic formAbstract (French)
La reactivite des poudres de bioxyde d'uranium dans differentes atmospheres (hydrogene, vide ou argon), a ete comparee par la mesure de leur surface specifique. L'influence de l'ecart a la stoechiometrie a ete egalement examinee. Les resultats experimentaux montrent que: - dans l'hydrogene, la surface specifique de la poudre de bioxyde decroit a partir de 900 deg. C; - dans l'argon ou sous vide, la surface d'un oxyde stoechiometrique diminue rapidement entre 700 et 800 deg. C, et cela d'autant plus que la surface initiale est plus grande. Si des traces d'oxygene sont introduites avant l'experience, la surface commence a diminuer des 500 deg. C. En conclusion, la reactivite de la poudre de bioxyde d'uranium est en relation avec sa surface specifique. Elle est plus elevee dans l'argon ou le vide que dans l'hydrogene, elle est plus elevee pour un oxyde non stoechiometrique que pour un oxyde stoechiometrique. (auteur)Files
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Additional details
Additional titles
- Original title (French)
- Influence de l'atmosphere sur la reactivite des poudres d'oxyde d'uranium (1960)
Publishing Information
- Imprint Pagination
- 22 p.
- Report number
- CEA-R--1661
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 38105033
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ARGON; BULK DENSITY; CHEMICAL PREPARATION; CONTROLLED ATMOSPHERES; HYDROGEN; POWDERS; SINTERED MATERIALS; SINTERING; SPECIFIC SURFACE AREA; STOICHIOMETRY; STRUCTURAL CHEMICAL ANALYSIS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; TEXTURE; URANIUM DIOXIDE; X-RAY DIFFRACTION
- Descriptors DEC
- ACTINIDE COMPOUNDS; ATMOSPHERES; CHALCOGENIDES; COHERENT SCATTERING; DENSITY; DIFFRACTION; ELEMENTS; FABRICATION; FLUIDS; GASES; MATERIALS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE GASES; SCATTERING; SYNTHESIS; TEMPERATURE RANGE; URANIUM COMPOUNDS; URANIUM OXIDES
Optional Information
- Notes
- 6 refs.