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Segregation in bimetallic nanowires: Size and thermodynamic ensemble effects

机译:双金属纳米线中的偏析:尺寸和热力学整体效应

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摘要

We investigate the thermodynamics of bimetallic nanowires via a rigid lattice approach. This allows us to detail the behavior of edge and core sites of the chain in the case of an alloy that forms an ideal solution. The influence of chain length on segregation (i.e., the composition difference between core and edge sites) is analyzed in the semigrand canonical (sGC) and in the canonical ensembles. Segregation varies monotonically with chain length in both ensembles, being enhanced at low concentrations and diminishing at large ones. For intermediate concentrations, segregation increases with chain length in the sGC ensemble, whereas it decreases in the canonical ensemble. This illustrates that the concentration profiles differ in both ensembles, the effect being emphasized at smaller sizes.
机译:我们通过刚性晶格方法研究双金属纳米线的热力学。在形成理想解决方案的合金的情况下,这使我们能够详细描述链的边缘和核心部位的行为。在半经典正则(sGC)和正则集合中分析了链长对偏析的影响(即核心和边缘位置之间的成分差异)。分离在两个集合中随链长单调变化,在低浓度下增强,而在大浓度下减小。对于中间浓度,在sGC集合中偏析随链长而增加,而在典型集合中则偏少。这说明浓度分布在两个集合中都不同,在较小的尺寸上会增强效果。

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  • 来源
    《Physical review》 |2012年第5期|p.054205.1-054205.11|共11页
  • 作者单位

    LEMHEIICMMO, Univ. Paris Sud, UMR 8182, F91405 Orsay Cedex, France;

    LEMHEIICMMO, Univ. Paris Sud, UMR 8182, F91405 Orsay Cedex, France,CNRS, UMR 8182, F91405 Orsay Cedex, France;

    LEMHEIICMMO, Univ. Paris Sud, UMR 8182, F91405 Orsay Cedex, France,CNRS, UMR 8182, F91405 Orsay Cedex, France;

    CEA, DEN, Service de Recherches de Metallurgie Physique, F91191 Gif-sur-Yvette Cedex, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    composition, segregation; defects and impurities;

    机译:组成;隔离;缺陷和杂质;

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