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arXiv 1311.7108cond-mat.mtrl-sci
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用3d过渡元素掺杂二十面体Fe $_{13}$

Doping icosahedral Fe$_{13}$ with 3d transition elements

Anteneh G. Tefera, Mogus D. Mochena

摘要:

我们的密度泛函理论计算Fe_{13-n} M_{n}的M = Sc,Ti,V,Cr,Mn,Co,Ni,Cu到n = 4表明,二十面体对称的Fe 13,虽然键长的微小变化,是强大的,尽管掺杂和保留所有的同伦的Mn,Co,Ni和Cu。基于对掺杂团簇的态密度、碳原子的吸附和单壁碳纳米管碎片的粘附能的分析,我们提出了一种核-壳结构,其中心Mn原子被Fe表面壳原子包围,是最有利于单壁碳纳米管成核和生长的掺杂纳米催化剂,掺杂团簇保留了二十面体对称性。对于掺杂超过涉及二十面体的表面壳层的中心原子,Ni是最好的候选者。

英文摘要:

Our density functional theory calculations for Fe_{13-n}M_{n} for M = Sc, Ti, V, Cr, Mn, Co, Ni, and Cu up to n = 4 show that the icosahedral symmetry of Fe13, albeit minor changes in bond lengths, is robust despite doping and is retained for all homotops of Mn, Co, Ni and Cu. Based on analysis of density of states of the doped cluster, adsorption of carbon atom, and adhesion energies for fragments of single walled carbon nanotubes, we propose a core-shell type structure with a central Mn atom surrounded by Fe surface shell atoms as the most favorable doped nanocatalyst for SWCNT nucleation and growth subject to constraints of retention of icosahedral symmetry by the doped cluster. For doping beyond the central atom involving the surface shell of the icosahedron, Ni is the best candidate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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