BOBET, Jean-Louis; CHEVALIER, Bernard; PASTUREL, Mathieu

doi:10.1016/j.intermet.2005.09.009

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BOBET, Jean-Louis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHEVALIER, Bernard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PASTUREL, Mathieu
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Intermetallics. 2006, vol. 14, n° 5, p. 544-550

Elsevier

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The crystal structure and the hydrogenation behaviour of more than 10 ternary compounds based on cerium (i.e. CeMX with M=Mn, Ni, Cu and X=Al, Ga, In, Si, Ge, Sn) is presented. Most of the structures can be described as a stacking of [Ce6] trigonal prisms occupied by a M or a X atom. All these compounds form stable hydrides and the kinetic behaviour can be linked to the H insertion sites and to the structural changes upon hydrogenation. If no structural change is observed during the formation of the hydride and if H atoms occupy [Ce3M] tetrahedral sites, the reaction with hydrogen is fast. But if a structural change occurs during hydrogenation, then, the reaction takes place slowly. Particular behaviour is reported when H atoms occupy (i) [Ce4] tetrahedral sites (slow kinetics without structural change) and (ii) [Ce3Ni2] or [Ce3Si2] bipyramidal sites (high kinetics without a structural change).< Réduire

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Rare-earth intermetallics

Crystallography

Hydrogen storage

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Relationship between structure and sorption kinetic behaviour for ternary CeMX compounds

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