Preparation and characterization of nanocrystalline Mg2FeH6
Preparation and characterization of nanocrystalline Mg2FeH6
复制标题
纳米晶Mg2FeH6的制备及表征
DOI:
10.1016/j.jallcom.2010.08.119
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发表时间:
2010-10
期刊:
影响因子:
--
通讯作者:
陈军
中科院分区:
文献类型:
--
作者:
陈军
We report on the preparation and characterization of nanocrystalline Mg2FeH6that is prepared by ball milling of 3Mg+Fe mixture under relatively lower hydrogen pressure (5.5bar) at room temperature. The phase, composition and morphology of the as-milled powders are characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM) and high-resolution TEM (HRTEM). The results show that the optimum formation time of Mg2FeH6phase is 100h and the abundance is about 90.1wt% deduced from Reitveld refinement. Together with Mg2FeH6, small amount of Fe and MgO are also present in the milled product. The as-prepared nanocrystalline Mg2FeH6, which exhibits a chrysanthemum-like spherical shape (Ø 100–200nm) with aggregated nanoparticles (Ø 10–20nm), starts to desorb hydrogen at 335K and ends at 613K with a total weight loss of 5.15wt%. The desorption enthalpy and entropy for the as-prepared nanocrystalline Mg2FeH6are −67.2±8kJ/molH2and −120.1±15J/KmolH2, respectively.
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