Published 1964
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Medium temperature reaction between lanthanide and actinide carbides and hydrogen
- 1. Commissariat a l'Energie Atomique, Fontenay-aux-Roses (France). Centre d'Etudes Nucleaires
Description
Hydrogen is fixed reversibly by the lanthanide and actinide mono carbides in the range 25 - 400 C, as for pure corresponding metals. Hydrogen goes into the carbides lattice through carbon vacancies and the total fixed amount is approximately equal to two hydrogen atoms per initial vacancy. Final products c.n thus be considered as carbo-hydrides of general formula M(C1-x, H2x). The primitive CFC, NaCl type, structure remains unchanged but expands strongly in the case of actinide carbides. With lanthanide carbides, hydrogenation induces a phase transformation with reappearance of the metal structure (HCP). Hydrogen decomposition pressures of all the studied carbo-hydrides are greater than those of the corresponding di-hydrides. (authors)
Availability note (English)
Available from INIS in electronic formAbstract (French)
Les monocarbures d'actinides et de lanthanides fixent reversiblement de l'hydrogene a temperature peu elevee, a peu pres dans les memes conditions que les metaux purs correspondants. L'hydrogene penetre dans le reseau des carbures par l'intermediaire des lacunes de carbone, et la quantite totale fixee est approximativement egale a deux atomes d'hydrogene par lacune initiale. Les produits obtenus peuvent donc etre consideres comme des carbohydrures de formule generale M(C1-x, H2x). La structure d'origine CFC, type NaCl est conservee, mais avec une forte expansion, dans le cas des carbures d'actinides. En revanche, l'hydrogenation entraine un changement de phase cristalline avec retour a la structure du metal (HC) pour les carbures de lanthanides. Tous les carbohydrures etudies ont des tensions de decomposition en hydrogene superieures a celles des dihydrures correspondants. (auteurs)Files
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Additional details
Additional titles
- Original title (French)
- Reaction a temperature moyenne entre les monocarbures de lanthanides et d'actinides et l'hydrogene
Publishing Information
- Imprint Pagination
- 56 p.
- Report number
- CEA-R--2602
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 37017796
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ACTINIDES; CARBIDES; CARBON; CRYSTAL STRUCTURE; HYDROGEN; HYDROGENATION; RARE EARTHS; YTTRIUM
- Descriptors DEC
- CARBON COMPOUNDS; CHEMICAL REACTIONS; ELEMENTS; METALS; NONMETALS; TRANSITION ELEMENTS
Optional Information
- Notes
- 18 refs.