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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis of hydrides by mechanical alloying in the Mg-Ni-Ge system
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Synthesis of hydrides by mechanical alloying in the Mg-Ni-Ge system

机译：在Mg-Ni-Ge体系中通过机械合金化合成氢化物

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摘要

We investigated the mechanical alloying (MA) of 2Mg-0.5Ni-0.5Ge mixture at room temperature under hydrogen atmosphere. The evolution of the phases during MA process and the thermal stability of the obtained hydrides were studied using XRD, DSC, DTA and TG. Formation of MgH_2 and Mg_2NiH_4 was observed at short milling times. Unreacted Ge in the product reduces the desorption temperature of MgH_2 in more than 100 deg C. As the milling time increases, the MA leads to the formation of a new Mg-based hydride in the Mg-Ni-Ge system. This novel hydride has a hydrogen content higher than 1 wt. percent and is stable upon heating up to 410 deg C. We present an alternative synthesis route for the Mg-Ni-Ge hydride that involves the MA of the 2Mg-0.5Ni-0.5Ge mixture under argon followed by short milling times under hydrogen atmosphere. Our results show that the ternary alloy obtained by milling of the 2Mg-0.5Ni-0.5Ge mixture under argon, with Mg_3MNi_2-type cubic structure, is the precursor of the novel Mg-Ni-Ge hydride.
机译：我们研究了氢气氛下室温下2Mg-0.5Ni-0.5Ge混合物的机械合金化（MA）。使用XRD，DSC，DTA和TG研究了MA过程中相的演变以及所得氢化物的热稳定性。在短研磨时间内观察到MgH_2和Mg_2NiH_4的形成。产品中未反应的Ge会在超过100摄氏度的温度下降低MgH_2的解吸温度。随着研磨时间的增加，MA会在Mg-Ni-Ge系统中形成新的基于Mg的氢化物。该新型氢化物的氢含量高于1重量％。百分比，并且在加热到410℃时稳定。我们提出了Mg-Ni-Ge氢化物的另一种合成路线，其中涉及2Mg-0.5Ni-0.5Ge混合物在氩气中的MA，然后在氢气气氛中短暂研磨。我们的结果表明，通过在氩气下将2Mg-0.5Ni-0.5Ge混合物研磨而获得的具有Mg_3MNi_2型立方结构的三元合金是新型Mg-Ni-Ge氢化物的前体。

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