Structural and hydrogen sorption properties of SmNi5−xAlx system – An experimental and theoretical study

Ability of hydrogen storage CeNi5-xGax and Mg2Ni alloys to hydrogenate acetylene

“…Substitution preference appears to be governed by size factors; larger atoms such as Al and Ga preferentially occupy the 3g, while smaller atoms tend to substitute at the 2c site. In the present study, Rietveld analysis also indicates that all of the Ga atoms occupy 3g sites, which agrees with a previous report [41] and other RE-Ni-Ga systems [14][15][16][17][18]. The lattice parameters and unit cell volume of CeNi 5-x Ga x alloys determined by Rietveld analysis are shown in Table 1 and Figure 3.…”

“…Substitution of group 13 elements for Ni may change the hydrogen capacity, equilibrium plateau pressures, and stability of their hydrides. Many intermetallic RENi 5 in which Ni was replaced with Al [4][5][6][7][8][9][10][11][12], Ga [13][14][15][16][17][18], or In [19], have been examined for their potential to improve hydrogen absorption properties. In these IMCs, the equilibrium plateau pressures generally decrease as Ni substitution increases.…”

Nanostructured materials for solid-state hydrogen storage: A review of the achievement of COST Action MP1103

“…Most studies are instead focusing on studying the effect of mixing different elements in certain ratios, thereby allowing the study of trends and making it possible to identify important regimes that subsequently can be studied in details experimentally or computationally. The latter approach was followed by Bili skov et al to study the effect of partially exchanging Ni for either Ga or Al in SmNi 5 H x [165,166]. In the combined experimental (XRD and hydrogen desorption) and computational (DFT) studies it was predicted that the intermetallics with Ga or Al substitutions would be thermodynamically stable.…”