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Contribution to the crystallographic study of the uranium-oxygenated system; Contribution a l'etude cristallographique du systeme uranium-oxygene

Abstract

Three uranium oxides, UO{sub 2}, U{sub 3}O{sub 8} and UO{sub 3} are known since a long time. The existence of a fourth, U{sub 2}O{sub 5}, is discussed. The mechanisms of decomposition between UO{sub 3} and U{sub 3}O{sub 8} have even some shadow zones. The aim of this report is the study of the phase relations in an uranium - oxygen system, from the metal until UO{sub 3}. We considered, on the one hand, the equilibrium relations, what should result in a diagram of phases in pressures and temperatures, on the other hand, the transformations bringing one oxide to the other, often by a continuous way and through intermediate of metastable phases. The introduction of the temperature and the consideration of the kinetics effects have permitted to raise the ambiguities. We adopted, to facilitate the presentation of the results, a partition a few arbitrary but convenient, in three chapters,: I - experimental Techniques II - Crystallographic species between U and UO{sub 3}. III - Kinetic of oxidisation of UO{sub 2}. (M.B.) [French] Trois oxydes d'uranium, UO{sub 2}, U{sub 3}O{sub 8} et UO{sub 3} sont connus depuis longtemps. L'existence d'un quatrieme, U{sub 2}O{sub 5}, est en suspend. Les mecanismes de decomposition entre  More>>
Authors:
Perio, P [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Apr 15, 1955
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-363
Resource Relation:
Other Information: TH: These ES sciences physiques; 25 refs
Subject:
36 MATERIALS SCIENCE; CRYSTAL LATTICES; DEFORMATION; DIFFUSION; GRAIN SIZE; LATTICE PARAMETERS; OXIDATION; PHASE STUDIES; REACTION KINETICS; URANIUM DIOXIDE; URANIUM OXIDES U3O8; URANIUM TRIOXIDE
OSTI ID:
20846029
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Faculte des Sciences de l'Universite de Paris, 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR06R0363018190
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
118 pages
Announcement Date:
Mar 29, 2007

Citation Formats

Perio, P. Contribution to the crystallographic study of the uranium-oxygenated system; Contribution a l'etude cristallographique du systeme uranium-oxygene. France: N. p., 1955. Web.
Perio, P. Contribution to the crystallographic study of the uranium-oxygenated system; Contribution a l'etude cristallographique du systeme uranium-oxygene. France.
Perio, P. 1955. "Contribution to the crystallographic study of the uranium-oxygenated system; Contribution a l'etude cristallographique du systeme uranium-oxygene." France.
@misc{etde_20846029,
title = {Contribution to the crystallographic study of the uranium-oxygenated system; Contribution a l'etude cristallographique du systeme uranium-oxygene}
author = {Perio, P}
abstractNote = {Three uranium oxides, UO{sub 2}, U{sub 3}O{sub 8} and UO{sub 3} are known since a long time. The existence of a fourth, U{sub 2}O{sub 5}, is discussed. The mechanisms of decomposition between UO{sub 3} and U{sub 3}O{sub 8} have even some shadow zones. The aim of this report is the study of the phase relations in an uranium - oxygen system, from the metal until UO{sub 3}. We considered, on the one hand, the equilibrium relations, what should result in a diagram of phases in pressures and temperatures, on the other hand, the transformations bringing one oxide to the other, often by a continuous way and through intermediate of metastable phases. The introduction of the temperature and the consideration of the kinetics effects have permitted to raise the ambiguities. We adopted, to facilitate the presentation of the results, a partition a few arbitrary but convenient, in three chapters,: I - experimental Techniques II - Crystallographic species between U and UO{sub 3}. III - Kinetic of oxidisation of UO{sub 2}. (M.B.) [French] Trois oxydes d'uranium, UO{sub 2}, U{sub 3}O{sub 8} et UO{sub 3} sont connus depuis longtemps. L'existence d'un quatrieme, U{sub 2}O{sub 5}, est en suspend. Les mecanismes de decomposition entre UO{sub 3} et U{sub 3}O{sub 8} possedent encore quelques zones d mbres. Le but propose dans ce memoire est l'etude des relations de phase dans le systeme uranium - oxygene, du metal jusqu'a UO{sub 3}. Nous avons ete amene a considerer, d'une part, les relations a l'equilibre, ce qui devrait se traduire par un diagramme de phases en pressions et temperatures, d'autre part, les transformations amenant, souvent d'une facon continue et par l'intermediaire de phases metastables, d'un oxyde a l'autre. L'introduction de la temperature et la consideration des effets de cinetique ont le plus souvent permis de lever les ambiguites rencontrees. Nous avons adopte, pour faciliter la presentation des resultats, une division un peu arbitraire mais commode, en trois chapitres: I - Techniques experimentales II - Especes cristallographiques entre U et UO{sub 3}. III - Cinetique d'oxydation de UO{sub 2}. (M.B.)}
place = {France}
year = {1955}
month = {Apr}
}