Desorption Kinetics of Hydrogen in Mg2NiH4 Hydride and in Hydrogeneated Eutectic (Mg/Mg2Ni)Hx |
| Journal |
Defect and Diffusion Forum (Volumes 283 - 286) |
| Volume |
Diffusion in Solids and Liquids IV |
| Edited by |
Andreas Öchsner, Graeme E. Murch and Ali Shokuhfar |
| Pages |
639-648 |
| DOI |
10.4028/www.scientific.net/DDF.283-286.639 |
| Online since |
March, 2009 |
| Authors |
Jiri Cermak, Lubomir Kral |
| Keywords |
Hydrogen Storage Material, Intermetallic Compound, Magnesium Alloys Hydrogen Diffusion |
| Abstract |
Mg-Ni alloys are perspective hydrogen-storage materials. In the present work, kinetics of hydrogen desorption was studied in Mg2NiH4 hydride and in hydrogenated eutectic (Mg/Mg2Ni)Hx. Time dependence of desorbed hydrogen was measured in temperature interval 552 –723 K and hydrogen diffusion coefficients were evaluated from obtained desorption curves. Results were interpreted in relation to phase composition investigated parallel by XRD. It was found that microtwinned low-temperature phase LT2 slows-down considerably the hydrogen desorption rate. |
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