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首页> 外文期刊>Nanotechnology >The formation mechanism and structural characterization of the mixed transition-metal complex hydride Mg_2(FeH_6)_(0.5)(CoH_5)_(0.5) obtained by reactive milling
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The formation mechanism and structural characterization of the mixed transition-metal complex hydride Mg_2(FeH_6)_(0.5)(CoH_5)_(0.5) obtained by reactive milling

机译：反应球磨混合过渡金属复合氢化物Mg_2（FeH_6）_（0.5）（CoH_5）_（0.5）的形成机理和结构表征

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摘要

Mg_2(Fe_(0.5)Co_(0.5)) elemental powder mixtures were processed by reactive ball milling in a H_2 (or D_2) atmosphere at about 50 bar. The changes of pressure were monitored during milling and hydrogen absorption was detected within the first 10 h of milling. X-ray and neutron powder diffraction analysis, followed by Rietveld refinement, suggests an almost complete conversion of the starting metals into the quaternary hydride Mg_2(FeH_6)_(0.5)(CoH_5)_(0.5).The latter has a cubic K_2PtCl_6-type structure (space group Fm3m) with a cell parameter a__6.42 _. Fe and Co atoms are disorderly distributed in the 4a position. Hydrogen desorption upon heating was investigated by both in situ x-ray diffraction and temperature programmed desorption analysis. Hydrogen is released in a one-step desorption reaction at temperatures between 500 and 600 K, with Mg and a FeCo solid solution as desorption products. Finally, Mg_2(FeH_6)_(0.5)(CoH_5)_(0.5) was also synthesized by ball milling equi-molar mixtures of Mg_2FeH_6 and Mg_2CoH_5 in Ar.
机译：Mg_2（Fe_（0.5）Co_（0.5））元素粉末混合物在H_2（或D_2）气氛中，约50 bar的压力下通过反应球磨进行处理。在研磨过程中监测压力变化，并在研磨的前10小时内检测到氢吸收。 X射线和中子粉末衍射分析，然后进行Rietveld精炼，表明原料金属几乎完全转化为季氢化物Mg_2（FeH_6）_（0.5）（CoH_5）_（0.5）。后者具有立方K_2PtCl_6-单元格参数为a__6.42 _的类型结构（空间组Fm3m）。 Fe和Co原子无序分布在4a位。通过原位x射线衍射和程序升温脱附分析研究了加热后的氢气脱附。氢气在500至600 K之间的一步解吸反应中释放出氢气，其中Mg和FeCo固溶体为解吸产物。最后，还通过在Ar中球磨Mg_2FeH_6和Mg_2CoH_5的等摩尔混合物，合成了Mg_2（FeH_6）_（0.5）（CoH_5）_（0.5）。

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