Les alliages terre rare-magnesium riches en magnesium et leur application au stockage de l'hydrogene

Microstructural optimization of LaMg12 alloy for hydrogen storage

“…High hydrogenation temperatures, repeated cycling of H absorption and desorption, application of reactive ball milling in hydrogen atmosphere and long interaction times are required to achieve high/complete hydrogenation of LaMg 12 [4][5][6]. As the LaMg 12±x intermetallic has a broad homogeneity range from x = −1.2 to x = 1.0 at 600 • C [7], obviously, the H absorption and desorption behaviours are composition-dependent.…”

Metallography and hydrogenation behaviour of the alloy Mg-72 mass%–Ni-20 mass%–La-8 mass%

“…Such a uniform distribution of La 2 Mg 17 and, consequently, LaH 3 in the H absorbing material may contribute to the explanation of the catalytic role of La in the hydrogenation process observed in [4]. Darriet et al studied in detail the hydrogen interaction with the La 2 Mg 17 phase [7]. However, the overall equation of the Fig.…”

“…EDX line-scan data for the as-prepared (a) and hydrogenated (b) specimens of the alloy (see text). hydrogenation reported in [7]:…”

Thermodynamic assessment of the La–Mg system

“…Its homogeneity range estimated from lattice parameters extends from 91.67 to 92.86 at.% Mg at 886 K [9]. In the present work, LaMg 12 is treated as the formula (La,Mg)(La,Mg) 12 by a two-sublattice model [7,8].…”