Hydrogen storage in Mg–Ni–Fe compounds prepared by melt spinning and ball milling

Hydrogen-storage properties of Mg–23.5Ni–(0 and 5)Cu prepared by melt spinning and crystallization heat treatment

“…Palade et al [27] studied on the hydrogen-storage properties of Mg-rich Mg-Ni-Fe intermetallic compounds prepared by melt spinning and ball milling. The maximum hydrogen content of these compounds was larger than 5 wt% under 2.5 MPa and they desorbed all stored hydrogen in less than 120 s under 0.02 MPa at 579 K. These compounds had a better kinetic of hydrogen desorption than similar samples obtained by milling a mixture of MgH 2 , Ni, and commercial powders.…”

Mössbauer study of Mg–Ni(Fe) alloys processed as materials for solid state hydrogen storage

“…As described elsewhere [6], the starting ribbons appear mainly amorphous with overlapped sharp peaks of Mg and metastable Mg 6 Ni phase, while milled ribbons as sample A are crystalline exhibiting Mg and Mg 2 Ni phases. No evidence of metallic iron or iron phases can be seen in the XRD patterns of as spun and milled ribbons.…”

“…This broad shape was well fitted only with a distribution of magnetic hyperfine fields, while the spectra of milled and hydrogenated ribbons could be well fitted both with discrete components and hyperfine field distributions. The hyperfine parameters obtained by fitting the experimental data are given in Table I This suggests a substantial increase of crystallinity during milling (supported by XRD data [6]), but preserving the local environment of iron unchanged. Additionally, the hyperfine field distribution of milled ribbon shows a peak at 33 T due to the presence of metallic iron.…”

“…Sample A was obtained by milling the ribbons using a SPEX8000 shaker mill with a ball to powder weight ratio of 10/1 and a milling time of 6 h. Sample B, having similar composition, was obtained by ball milling for 20 h in the same conditions commercial powders of MgH 2 , Ni, Fe in the proportion (MgH 2 ) 88 Ni 11 Fe 1 . The preparation details of samples studied in the present work are described elsewhere [6]. Due to the different preparation routes, it is expected that sample A would present a more homogeneous distribution of the alloyed elements than sample B.…”

The Preparation and Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg2Ni-Type Alloys

“…Therefore, the investigation in this area has been focused on finding the ways to substantially ameliorate the hydriding/dehydriding kinetics of Mg and Mgbased alloys. Various attempts, particularly mechanical alloying (MA) [6] and melt spinning [7], have been conducted to ameliorate the kinetic property of Mg-based metallic hydrides. And the worldwide researchers have carried out a lot of investigations and have obtained some extremely important results.…”