| Title |
Formation of a High Pressure Form of Magnesium Hydride γ-MgH2 by Mechanical Grinding under Low Hydrogen Pressure |
| Authors |
(Myoung Youp Song); (Young Jun Kwak); (Seong Ho Lee); (Hye Ryoung Park) |
| DOI |
https://doi.org/10.3365/KJMM.2013.51.2.119 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
hydrogen absorbing materials; mechanical alloying/milling; phase transformation; X-ray diffraction; magnesium hydride high pressure form |
| Abstract |
In order to investigate the formation of a high pressure form of magnesium hydride, γ-MgH2, X-ray diffraction patterns before and after the hydriding reaction were obtained for samples of MgH2, MgH2 after reactive mechanical grinding (RMG), and 94 wt% MgH2-6 wt% Ni after reactive mechanical grinding. In addition, absorbed hydrogen quantity versus time curves at the first cycle were examined. The MgH2 sample did not contain γ-MgH2. However, the MgH2 after RMG and the 94 wt% MgH2-6 wt% Ni after RMG contained γ-MgH2. All these results prove that after reactive mechanical grinding, γ-MgH2, one of the high pressure forms of MgH2, was formed in the MgH2 and 94 wt% MgH2-6 wt% Ni samples under low hydrogen pressures. |