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Comparative ab initio study of CO adsorption on Sc _n and Sc _nO (n = 2-13) clusters

机译:从头开始研究CO在Sc _n和Sc _nO(n = 2-13)团簇上的吸附

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摘要

Using a cluster model, we investigated the similarities and differences in chemical activity and the magnetic properties of Sc _n clusters (n = 2-13) and their oxides, Sc _nO, toward CO molecule adsorption via a spin-polarized density functional theory approach. The Sc _n and Sc _nO clusters have similar chemical activity at small sizes of n = 2-10, whereas remarkable differences are observed at large sizes of n = 11-13. More interestingly, different magnetic responses are found in the Sc _n and Sc _nO clusters with the presence of CO molecule: The magnetic moment is attenuated significantly for Sc _n with n = 2, 4, 12, and 13, whereas for Sc _nO, it is enhanced at n = 4 and 13 and is reduced for n = 7, 8, 10, and 11. In particular, the magnetic moment remarkably increases from 7 μ _B of Sc 13O to _(13) μ _B of Sc _(13)OCO, whereas it reduces from 19 μ _B of Sc _(13) to 5 μ _B of Sc _(13)CO
机译:使用簇模型,我们通过自旋极化密度泛函理论方法研究了Sc_n簇(n = 2-13)及其氧化物Sc_nO对CO分子吸附的化学活性和磁性能的异同。在n = 2-10的小尺寸下,Sc_n和Sc_nO团簇具有相似的化学活性,而在n = 11-13的大尺寸下,观察到明显的差异。更有趣的是,在存在CO分子的情况下,在Sc _n和Sc _nO团簇中发现了不同的磁响应:当n = 2、4、12和13时,Sc _n的磁矩显着衰减,而对于Sc _nO,磁矩明显减小。在n = 4和13时增强,在n = 7、8、10和11时减小。特别是,磁矩从Sc 13O的7μ_B显着增加到Sc _(13 OCO,而从Sc _(13)CO的19μ_B降至Sc _(13)CO的5μ_B

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