Interrelation between Hydrogen Desorption Kinetics and Structure of (Mg2Ni)Hx and Hydrogenated Eutectic(Mg/Mg2Ni)Hy |
| Journal |
Defect and Diffusion Forum (Volumes 289 - 292) |
| Volume |
Diffusion in Materials - DIMAT2008 |
| Edited by |
A. Agüero, J.M. Albella, M.P. Hierro, J. Phillibert and F.J. Pérez Trujillo |
| Pages |
167-174 |
| DOI |
10.4028/www.scientific.net/DDF.289-292.167 |
| Online since |
April, 2009 |
| Authors |
Jiri Cermak, Lubomir Kral |
| Keywords |
Hydrogen Diffusion, Hydrogen Storage Material, Intermetallic Compound, Magnesium Alloy |
| Abstract |
Mg-rich alloys of the binary system Mg-Ni are prospective hydrogen-storage materials. In the present study, desorption characteristics of hydrided Mg2Ni intermetalic and hydrided Mg/Mg2Ni eutectic mixture were investigated. Structure of experimental materials during the hydrogenation was observed by SEM. Three modifications of (Mg2Ni)Hx (x ~ 4) were prepared differing in the ratio of two low-temperature phases f = LT2/LT1: with (i) f >1, (ii) f ~ 1 and with (iii) f <1. Evolution of the ratio f during hydrogen desorption was checked by XRD. It was found that the micro-twinned phase LT2 is not desirable in hydrogen-storage materials containing Mg2Ni intermetallic. Diffusion coefficient of hydrogen in LT2 is about 20 times lower than in LT1. |
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