| Abstract
| - The Li−Mg−N−H system composed of 3Mg(NH2)2 and 8LiH reversibly desorbs/absorbs ∼7 wt % of H2 at120−200 °C and transforms into 4Li2NH and Mg3N2 after dehydrogenation. In this work, the mechanism ofthe hydrogenation reaction from 4Li2NH and Mg3N2 to 8LiH and 3Mg(NH2)2 was investigated in detail.Experimental results indicate that 4Li2NH is first hydrogenated into 4LiH and 4LiNH2. At the next step,4LiNH2 decomposes into 2Li2NH and 2NH3, and the emitted 2NH3 reacts with (1/2)Mg3N2 and produces the(3/2)Mg(NH2)2 phase, while the produced 2Li2NH is hydrogenated into 2LiH and 2LiNH2 again. Suchsuccessive steps continue until all 4Li2NH and Mg3N2 completely transform into 8LiH and 3Mg(NH2)2 byhydrogenation.
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