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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2004); 20040822-26; Sendai(JP) >Structural and Hydriding Properties of the Mg-Ni-H System with Nano- and/or Amorphous Structures
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Structural and Hydriding Properties of the Mg-Ni-H System with Nano- and/or Amorphous Structures

机译：具有纳米和/或非晶结构的Mg-Ni-H体系的结构和氢化性质

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摘要

Structural properties of the Mg-Ni alloys have been extensively investigated to improve their hydriding properties. The alloys Mg-x at.%Ni (x = 33, 38, 43 and 50) with different nanometer-scale structures were successively synthesized by mechanical grinding of Mg_2Ni with Ni. Nanostructured Mg_2Ni (n-Mg_2Ni) was obtained by grinding only Mg_2Ni (x = 33). Amorphous MgNi (a-MgNi) was partially formed by grinding of Mg_2Ni with additional Ni (x = 38 and 43), and was homogeneously formed in equivalent composition (x = 50). The hydriding temperatures decrease from 440 K for x = 33 to 373 K for x = 50 with increasing the Ni amounts. The electrochemical p-c isotherm measurements revealed that there is obviously the miscibility gap (plateau) pressure higher than 10~(-4) MPa at ambient temperature even in the amorphous phase. The coordination numbers and interatomic distances of the Mg-D and Ni-D correlations in the a-MgNi-D show that deuterium occupies the interstitial tetrahedral site composed of nearly 2Mg-2Ni. The interatomic distances continuously decrease with increasing Li amounts in Li_xMg_(1-x)Ni-H (x = 0, 0.25 and 0.50).
机译：Mg-Ni合金的结构性能已得到广泛研究，以改善其氢化性能。通过用Ni对Mg_2Ni进行机械研磨，依次合成了具有不同纳米级结构的Mg-x at。％Ni（x = 33、38、43和50）合金。通过仅研磨Mg_2Ni（x ＝ 33）获得纳米结构的Mg_2Ni（n-Mg_2Ni）。非晶态MgNi（a-MgNi）是通过将Mg_2Ni与另外的Ni一起研磨而部分形成的（x = 38和43），并以相等的组成均匀地形成（x = 50）。随着Ni含量的增加，氢化温度从x = 33的440 K降低到x = 50的373K。电化学p-c等温线测量表明，即使在无定形相中，在环境温度下，明显存在高于10〜（-4）MPa的混溶间隙（平台）压力。 a-MgNi-D中Mg-D和Ni-D相关性的配位数和原子间距离表明，氘占据了由近2Mg-2Ni组成的间隙四面体位点。随着Li_xMg_（1-x）Ni-H（x = 0、0.25和0.50）中Li含量的增加，原子间距离不断减小。

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