In-situ neutron diffraction study of magnesium amide/lithium hydride stoichiometric mixtures with lithium hydride excess

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• 作者：Francesco Dolci ; Eveline Weidner ; Markus Hoelzel ; Thomas Hansen ; Pietro Moretto ; Claudio Pistidda ; Michela Brunelli ; Maximilian Fichtner ; Wiebke Lohstroh
• 关键词：Hydrogen storage ; In-situ neutron diffraction ; Intermediate reaction ; Li₂Mg₂(NH)₃
• 刊名：International Journal of Hydrogen Energy
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：35
• 期：11
• 页码：5448-5453
• 全文大小：753 K

文摘

The hydrogen sorption of mixtures of magnesium amide (Mg(NH₂)₂) and lithium hydride (LiH) with different molecular ratios have been investigated using in-situ neutron diffraction; the experiments were performed at D20/ILL and SPODI/FRMII. The results reveal a common reaction pathway for 1:2, 3:8 and 1:4 magnesium amide: lithium hydride mixtures. Intermediate reaction steps are observed in both ab- and desorption. The thermodynamic properties of the system at 200 °C are not changed by the addition of excess lithium hydride. This finding has important implications for the tailoring the characteristics of this promising hydrogen storage material.