کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1624783 1516423 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystal structure determination and reaction pathway of amide–hydride mixtures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Crystal structure determination and reaction pathway of amide–hydride mixtures
چکیده انگلیسی

Combined synchrotron in situ X-ray diffraction and neutron diffraction studies were performed on 2:1 mixtures of lithium amide and magnesium hydride, which have shown promise as solid-state hydrogen storage materials. The dehydrogenated product is a mixed lithium and magnesium imide, Li2Mg(NH)2, whose crystal structure has not heretofore been determined. Furthermore, at elevated temperatures, Li2Mg(NH)2 undergoes two structural transitions from an orthorhombic structure to a primitive cubic structure at intermediate temperature (350 °C) followed by a face-centered cubic crystal structure at high temperature (500 °C). Disordering of the Li, Mg and cation vacancies as a function of temperature drives the structural transitions. We report the reaction pathway from in situ X-ray diffraction studies and the crystal structures of the three structural variants of Li2Mg(NH)2 as determined by high-resolution X-ray and neutron powder diffraction. We also report the hydrogen storage reaction pathways for mixtures with other cation ratios.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 454, Issues 1–2, 24 April 2008, Pages 233–244
نویسندگان
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