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Hydride formation in ball-milled and cryomilled Mg-Fe powder mixtures

机译:球磨和冷磨Mg-Fe粉末混合物中的氢化物形成

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We report on the formation of the ternary hydride Mg_2FeH_6 in mechanically activated powders. Powder mixtures with nominal composition Mg_(67) Fe_(33) were ball-milled in an inert Ar atmosphere either at room temperature or at liquid nitrogen temperature (cryomilling), and subsequently hydrogenated at different pressures at 622 K in a Sieverts-type apparatus. X-ray diffraction data from the hydrided products show Mg_2FeH_6 is formed directly from 2Mg+ Fe + 3 H_2. Cryomilling improves the hydrogen absorption kinetics, but also results in a decrease of the total yield of Mg_2FeH_6. This is likely due to MgH_2 being kinetically favoured, and in turn acting as a competitor to the formation of the ternary hydride. The absorption data is discussed in the framework of the Johnson-Mehl-Avrami model, which suggests the formation of Mg_2FeH_6, occurs via interface-controlled growth processes.
机译:我们报告了在机械活化粉末中三元氢化物Mg_2FeH_6的形成。将标称成分为Mg_(67)Fe_(33)的粉末混合物在惰性Ar气氛中于室温或液氮温度下进行球磨(低温研磨),然后在Sieverts型设备中于622 K的不同压力下进行氢化。来自氢化产物的X射线衍射数据表明,Mg_2FeH_6直接由2Mg + Fe + 3H_2形成。低温研磨可改善氢吸收动力学,但也会导致Mg_2FeH_6的总产率降低。这可能是由于MgH_2在动力学上受到青睐,并进而与三元氢化物的形成竞争。在Johnson-Mehl-Avrami模型的框架中讨论了吸收数据,这表明Mg_2FeH_6的形成是通过界面控制的生长过程发生的。

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