|
Vol.51, No.2, 119 ~ 124, 2013
|
| Title |
| Formation of a High Pressure Form of Magnesium Hydride γ-MgH2 by Mechanical Grinding under Low Hydrogen Pressure |
| Myoung Youp Song , Young Jun Kwak , Seong Ho Lee , Hye Ryoung Park |
|
|
|
| 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. |
|
|
| Key Words |
| hydrogen absorbing materials, mechanical alloying/milling, phase transformation, X-ray diffraction, magnesium hydride high pressure form |
|
|
 |
|
