Structural and hydrogen absorption/desorption properties of YNi_4−xAl_xMg compounds (with 0 ≤ x ≤ 1.5)

Cristina Stan (1) , Ecaterina Andronescu (1) , D. Predoi (2) , Jean-Louis Bobet (3)

1 Department of Science and Engineering of Oxide Materials and Nanomaterials
2 National Institute for Physics of Materials
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The compounds YNi_4−xAl_xMg with 0 ≤ x ≤ 1.5, crystallizing in the C15 structure type (MgCu₄Sn-type), have been elaborated by mechanical milling and a subsequent heat treatment at 650 °C for 1 h. It was possible to synthesize the compounds YNi_4−xAl_xMg with x up to approximately 1.15 and the lattice parameters was in good agreement with those already reported. All the samples, excepting the YNi₄Mg compound, absorbed and desorbed hydrogen reversibly and no structural change is reported after the hydrogenation. A direct relationship between the lattice parameters and the equilibrium plateau pressure was found.

Mots clés: Intermetallics; Hydrogen storage; Mg-based alloys

Domaines: Matériaux

Cristina Stan, Ecaterina Andronescu, D. Predoi, Jean-Louis Bobet. Structural and hydrogen absorption/desorption properties of YNi_4−xAl_xMg compounds (with 0 ≤ x ≤ 1.5). Journal of Alloys and Compounds, 2008, 461 (1-2), pp.228-234. ⟨10.1016/j.jallcom.2007.07.064⟩. ⟨hal-00380998⟩