Crystal structure analysis in the dehydrogenation process of Mg(NH 2)2-LiH system

Tatsuo Noritake, Masakazu Aoki, Shin Ichi Towata, Yuko Nakamori, Shin Ichi Orimo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)


Mg(NH2)2-LiH system which have the properties of reversible hydrogenation and dehydrogenation is one of the promising candidates for new hydrogen storage materials. For understanding of the reversible reaction mechanism, we investigated the crystal structure changes in 3Mg(NH 2)2-12LiH system using the pressure-composition (p-c) isotherm measurement and synchrotron X-ray diffraction. The sample was prepared by the hydrogenation of Mg3N2 + 4Li3N. At the several dehydrogenation stages of the p-c isotherm measurement at temperature 523 K, the sample was taken out and X-ray diffraction measurement was performed. By the amount of desorbed hydrogen, the reaction was expressed as the following formula, Mg(NH2)2 + 4LiH - LixMg(NH 2)2-x(NH)x + (4-x)LiH + xH2 (x = 0-2). The crystal structures of LixMg(NH2(NH)x, similar to CaF2-type one, formed during the dehydrogenation reaction were determined by Rietveld analysis. As a result, it is considered that the dehydrogenation process might relate to the diffusion of Li+ ion in cation sites of Mg(NH2)2.

Original languageEnglish
Title of host publicationHydrogen Storage Technologies
PublisherMaterials Research Society
Number of pages5
ISBN (Print)9781604234206
Publication statusPublished - 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Dec 1

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2006 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA


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