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Contribution to the study of the uranium-hydrogen system; Contribution a l'etude du systeme uranium-hydrogene

Abstract

Previous work on uranium-hydrogen system is reviewed. The U-H{sub 2}-UH{sub n} equilibrium is then investigated at pressures below one atmosphere, i.e. at temperatures lower than 430 deg. C. The hydride obtained at equilibrium is deficient in hydrogen (UH{sub n<3}), the hydrogen deficit increasing as the temperature rises. Thermodynamic functions for the formation of non-stoichiometric hydride and of one hydrogen vacancy are derived from pressure composition isotherms, in U-H phase diagram is proposed. The hydrogenation of U-UC alloys is also examined at pressures below one atmosphere with regard to the equilibrium: (free U + UC) - H{sub 2}-UH{sub n}. The equilibrium conditions are found different from that observed for pure uranium. (author) [French] Une etude bibliographique du systeme uranium-hydrogene est exposee. L'equilibre U-H{sub 2}-UH{sub n} est ensuite etudie sous des pressions inferieures a une atmosphere, soit aux temperatures inferieures a environ 430 degs. C. L'hydrure obtenu a l'equilibre est deficitaire en hydrogene - UH{sub n<3} - et d'autant plus que la temperature s'eleve. Les grandeurs thermodynamiques relatives a la formation et a la saturation de l'hydrure, ainsi qu'a la formation d'une lacune d'hydrogene sont deduites des pressions d'equilibre. Un modele de diagramme de phases U-H est propose. L'hyduration des alliages U-UC  More>>
Authors:
Chevallier, J [1] 
  1. Commissariat a l'Energie Atomique, Grenoble (France). Centre d'Etudes Nucleaires
Publication Date:
Jan 01, 1965
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2777
Resource Relation:
Other Information: TH: These sciences; 86 refs
Subject:
36 MATERIALS SCIENCE; EQUILIBRIUM; HYDROGEN; HYDROGENATION; MICROSTRUCTURE; PHASE DIAGRAMS; PRESSURE DEPENDENCE; STOICHIOMETRY; TEMPERATURE DEPENDENCE; URANIUM; URANIUM CARBIDES; URANIUM HYDRIDES; VACANCIES
OSTI ID:
20706575
Research Organizations:
CEA Grenoble, 38 (France); Faculte des Sciences de l'Universite de Grenoble, 38 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2777021780
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
53 pages
Announcement Date:
Apr 27, 2006

Citation Formats

Chevallier, J. Contribution to the study of the uranium-hydrogen system; Contribution a l'etude du systeme uranium-hydrogene. France: N. p., 1965. Web.
Chevallier, J. Contribution to the study of the uranium-hydrogen system; Contribution a l'etude du systeme uranium-hydrogene. France.
Chevallier, J. 1965. "Contribution to the study of the uranium-hydrogen system; Contribution a l'etude du systeme uranium-hydrogene." France.
@misc{etde_20706575,
title = {Contribution to the study of the uranium-hydrogen system; Contribution a l'etude du systeme uranium-hydrogene}
author = {Chevallier, J}
abstractNote = {Previous work on uranium-hydrogen system is reviewed. The U-H{sub 2}-UH{sub n} equilibrium is then investigated at pressures below one atmosphere, i.e. at temperatures lower than 430 deg. C. The hydride obtained at equilibrium is deficient in hydrogen (UH{sub n<3}), the hydrogen deficit increasing as the temperature rises. Thermodynamic functions for the formation of non-stoichiometric hydride and of one hydrogen vacancy are derived from pressure composition isotherms, in U-H phase diagram is proposed. The hydrogenation of U-UC alloys is also examined at pressures below one atmosphere with regard to the equilibrium: (free U + UC) - H{sub 2}-UH{sub n}. The equilibrium conditions are found different from that observed for pure uranium. (author) [French] Une etude bibliographique du systeme uranium-hydrogene est exposee. L'equilibre U-H{sub 2}-UH{sub n} est ensuite etudie sous des pressions inferieures a une atmosphere, soit aux temperatures inferieures a environ 430 degs. C. L'hydrure obtenu a l'equilibre est deficitaire en hydrogene - UH{sub n<3} - et d'autant plus que la temperature s'eleve. Les grandeurs thermodynamiques relatives a la formation et a la saturation de l'hydrure, ainsi qu'a la formation d'une lacune d'hydrogene sont deduites des pressions d'equilibre. Un modele de diagramme de phases U-H est propose. L'hyduration des alliages U-UC est etudiee egalement sous des pressions inferieures a l'atmosphere, au point de vue de l'equilibre (U libre + UC) - H{sub 2}-UH{sub n}. Les conditions d'equilibre sont trouvees differentes de celles observees sur l'uranium pur. (auteur)}
place = {France}
year = {1965}
month = {Jan}
}