Preparation and characterization of nanocrystalline Mg2FeH6

Preparation and characterization of nanocrystalline Mg2FeH6
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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:
J. Alloys Compds.
影响因子:
--
通讯作者:
陈军
陈军
中科院分区:
其他
文献类型:
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作者:
陈军

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本文报道了在较低氢压(5.5bar)下,采用球磨法制备纳米晶Mg_2FeH_6的方法。采用X射线衍射(XRD)、透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM)对粉体的物相、成分和形貌进行了表征。结果表明,Mg 2FeH 6相的最佳形成时间为100 h,Reitveld法计算出Mg 2FeH 6相的丰度约为90.1wt%。与Mg 2FeH 6一起,少量的Fe和MgO也存在于研磨产物中。所制备的Mg_2FeH_6纳米晶呈类铬球形(约100- 200 nm),纳米颗粒(约10- 20 nm)聚集在一起,在335 K开始放氢,在613 K结束放氢,总失重为5.15wt%。Mg 2FeH 6纳米晶的脱附焓和熵分别为−67.2± 8 kJ/molH 2和−120.1± 15 J/KmolH 2。
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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