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The role of grain boundaries in the mechanism of plasma immersion hydrogenation of nanocrystalline magnesium films

机译：晶界在纳米晶镁薄膜等离子体浸没氢化机理中的作用

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In this paper, attention in focused on the nanostructured magnesium films for hydrogen storage. It is shown that 2 mu m thick Mg film is transformed into MgH2 film under high-flux and fluence hydrogen plasma immersion ion implantation at 450 K for 15 min. All hydrogen desorbs at temperature about 530 K, which corresponds to the decomposition of MgH2 -> Mg + H-2 up arrow. The macroscopic and microscopic observations show that magnesium film undergoes a high deformation and restructuring during hydrogenation-dehydrogenation reaction. The suggested hydrogenation model is based upon the incorporation of excess of hydrogen atoms in grain boundaries of nanocrystalline Mg film driven by the increase in surface chemical potential associated with the implantation flux. The results provide new aspects of hydriding of thin nanocrystalline film materials under highly non-equalibrium conditions on the surface. (c) 2005 Elsevier B.V. All rights reserved.
机译：在本文中，注意力集中在用于储氢的纳米结构镁膜上。结果表明，在高通量和注量氢等离子体沉浸离子注入中，在450 K下注入15 min，将2μm厚的Mg膜转变为MgH2膜。所有氢在约530 K的温度下解吸，这对应于MgH2-> Mg + H-2向上箭头的分解。宏观和微观观察表明，镁膜在加氢-脱氢反应过程中发生很大的变形和重构。建议的氢化模型基于在与注入通量相关的表面化学势增加的驱动下，纳米晶Mg膜晶界中引入了过量的氢原子。结果提供了在表面上高度不平衡的条件下纳米薄膜材料氢化的新方面。 （c）2005 Elsevier B.V.保留所有权利。

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